This video helped me solve my coolant heat exchange pipe issue that had became damaged from a road hazard. My shop didn’t know either. They gave me an atta-boy for figuring it out, but my thanks goes to you Sir. Thank you.
Professor Kelly, I like you voice, your deep knowledge, willingness to teach & share this knowledge : you are true inspiration to so many people : your teaching a blessing to the world : Cheers Buddy
Meg drives our 2005 Toyota Prius II with 138K+ miles : cut off the rear muffler ^^ Strong Hybrid I drive our 2014 Honda CRz II with 17K+ miles : all OEM except LED's to replace halogen lamps : Weak Hybrid We also use our 2013 Honda PCX150 scooter with its crank mounted alternator starter generator : Barely Hybrid Meg & I also travel using Segway Minipro self-balancing personal mobility assist device : Fully Electric
Thank you SO much Professor John D Kelly for Producing, Editing and Narrating this fantastic series of educational videos. This is the most informative automotive show ever, clearest photography, sound, explanations and nothing is hidden. If I may say this, Professor Kelly you are an amazing person. Top marks. From the UK 🇬🇧🇺🇸.
Love these videos. Its clear enough for anyone to understand and goes deep enough so you know whats going on. Some asks whats regenerative breaking, someone might say well thats when a motor converts the energy from the wheels back to the battery. You know what were looking for, a simple but in depth explanation with the engine parts right there to show and demonstrate. Just awesome. Thank you sir.
I used to be a hybrid sceptic - I simply thought that the tech is not ready yet and that it was too complicated to be reliable. I have changed my mind after watching your explanation of Toyota`s HSD (eCVT) and eAWD. My next car will be eCVT eAWD from Toyota. There are few models on Japanese market so the choice is here. ... saying that I do not understand why Toyota`s marketing team is hiding Harrier from the rest of the world. It is the "cheapest Lexus SUV" on the market. Has classic looks and makes a great SUV. It sells in big numbers on Japanese market. It is a true posh RAV4 ;) Thank you so much for your work.
That's what I do too with new "toys". Turn it on so I know it works before I thinker with it, then opening it up so I know how it works and finally put it back together. If it does not work anymore, then I know I did something wrong because I confirmed it worked before.
This is a fascinating tour and explanation of the vehicle’s cooling system professor Kelly. I enjoyed listening to your descriptions of the components. These cars are a marvel of technology. Thank you very much.
Being mostly focused on all-electric cars, I was not sure this video would have much relevance to my intended learning. But on thinking about it, I realize it's good to show me the complexity of ICE and hybrid vehicles.
Love your in-depth work explaining the cooling system. It is way to complicated more than it needs to be. But I understand how engineers think and work. They don’t teach simplicity in any engineering school. I would simplify the system by cooling the liquid by passing the liquid over a bismuth telluride plate, which uses only 0.70 of a DC amp. Eliminating compressor and more moving parts. Please look it up. Heat is the enemy of all electrical systems. Love your work!
Thermoelectric coolers are notoriously inefficient. To match up, it would need to be both big, and run at quite a high voltage, neither of which is very cheap compared to what they have here.
brilliant Professor , im a qualified mechanic , i don't deal with hybrids , i think i need to enrol on a hybrid course , thanks your knowledge is fantastic , you got me really interested , Thank you from UK
Great video as usual Professor Kelly. We are now familiarising ourselves with hybrids...........close to 3 years. Amidst the thousands of naysayers of Hybrid techno;ogy, Toyota Hybrid is No. 1 here in Trinidad & Tobago, West Indies. Thank you so much.
I bought a 2024 Corolla hybrid and would really like to see a video on the pedestrian warning speaker and my options to disable or change the annoying spaceship sound without throwing a code. I know you briefly mentioned this in the video. Hoping to find a solution. Thank you for another great video, Sir
A fascinating video on learning (in depth) the way cooling systems are on modern hybrids vs traditional combustion engine cooling systems. Didn't know there were 2 separate water pumps, that there is so many hoses/circuits in that one radiator, etc.
I would thank you quite much for your help us , and I feel you are doing an arduous job for us giving precise knowledge about automobile technology ( such as Hybrid systems ) , and I would like fervently request you that if we can learn about automotive air conditioning systems from you we can repair those more confidently, because of your precise theories. thank you very much,,,, !
It's very interesting with all the detailed design at this complex cooling system for the internal combustion engine and the hybrid inverter, Toyota left the two hoses for the exhaust heat recirc system fully unshielded, especially when they run the entire length of the very hot 2nd catalytic converter. These hoses will probably spring a leak with high mileage cars.
Thanks for your feedback. The second catalytic converter has an external shield around it by the coolant hoses for the exhaust heat recirculation system. The system uses stainless steel pipes up a little further above the catalytic converters and the exhaust manifold. The hoses are only used where there is powertrain flexing. Have a good day!
The transaxle cooling system is quite robust when compared with the Gen 3 unit. I can see why they allow towing in some markets now. I've towed up to 1100 lbs with my 2010 while observing temps on MG1&2 and the inverter coolant temp to be well within standards. Great video as always.
WeberAuto According to a British car publication the Gen 4 is rated for 725 kg (1,598 lbs) in Europe. I've heard the Gen 3 was rated for towing in Europe also though I could not verify limits. Not sure if Toyota NA recommends towing for Gen 4 units sold here. Small teardrop shaped Travel trailers are very popular in Europe, I can imagine the Prius is well suited for that.
Creig Mac were you able to observe the transmission temperature as well? I have a 2018 Highlander hybrid that I plan to use for towing a 1200 lb trailer. I can’t find an OBD 2 scanner that will show the transmission temperature. Thanks
The post 2010 Prii have two disadvantages. One is the expensive to replace electric water pump. The second is the hard to service EGR valve. That's why I nominate the GEN 2 as the Prius you can keep cheap for 20 years. The taxi drivers here in San Diego buy old GEN 2s at 100k + and drive them to 400k. The old mechanical water pumps go over 150-200k and there is no EGR valve. The only GEN 2 problems seem to be the 2 Way hot-water valve and the inverter water pump that was on a recall. That pump was redesigned from a one bearing to two bearings on the shaft. Besides the cat going out at 150-200k and in Calif requiring an OEM cat at $1300-2000, the GEN 2 is bulletproof. As a bonus, the GEN2 had an available JBL audio system that beat the pants off the GEN 3 & 4 audio systems. And of course, you can easily service the main battery modules. Toyota will sell you a new battery you can install yourself for $1950 plus a $1300 core charge. Try that with a Prius Prime LION battery. The 2016 up Prii are great until the battery warranty expires. What is the resale value if the battery goes out? What is a dead Tesla worth? Not much.
Excellent description! I never knew the Prius has a 2 part radiator. Our Fiat 500e has 2 coolant loops, one for the battery and one for the battery charger, inverter / converter, and traction motor. The battery loop has it's own small radiator mounted in front of the ac condenser, and includes a 6kw heater and r134a heat exchanger so that the evecu can both cool and heat the battery. The other loop uses what looks like a normal 500 radiator mounted behind the condenser. The cabin heat is from a PTC element, there is no water heater core.
Thank you and thanks for the description of the cooling/heating systems on your 500e. Almost every EV I have seen have similar systems. I will be doing similar videos on the Chevrolet Bolt and Volt in the near futures.
Great info Professor, thank you! It's scary how many intricate moving parts are under a vehicle open to road grime and splatter. Thinking too how the salt and sand/dirt on the roads will interfere with the long term operations of these parts. Really have to question where the "technology meets the road" so to speak is really a "head on collision".
Thanks for your effort. A schematic diagram of the entire cooling system showing all components in separate loops for ICE & Electrics would be helpful. At 3:07 - the pins protruding from the electric water pump housing are an omnidirectional heat sink; a conical shape is actually the most efficient. I thought it was very strange to have a thermostat on the return line FROM the radiator; I would assume this is where the exhaust and EGR loops mix in, (?)
Toyota sold me a Toyota long life concentrated fluid, I will check with them again if it’s compatible. Thanks for a great detailed video. Very informative
I didn't hear you mentioning the inverter cooling pump assembly. I believe it is visible below the inverter inlet and outlets. It looks like it's readily accessible and easily replaceable from underneath the vehicle.
This is the first time I've ever seen a thermostat on a coolant inlet, usually they're on the outlet to the radiator. Is there a reason the thermostat is on the inlet in this case?
Thank you for the video. I was hoping that you would also explain how the heater for the interior work when the engine is not running. Or is it something you explain in a separated video?
Those two cats are going to cost big bucks in Calif where no aftermarket cats are available or legal. On the 2016 up Prii, I would only keep the car until the warranty expired and I would make sure I got the additional Toyota Platinum warranty. I think you can still buy the Toyota warranty up until the first year of ownership and you don't have to buy it from the selling dealer. On my 2005, I bought a 7 year warranty for $1000 but not from my San Diego dealer. I got a deal from a Toyota dealer in Rexburg, Idaho!
Professor can I have a question? I understand there is no V-belt to drive the water pump nor the AC compressor as you have shown in the video. Is there a generator/alternator which is driven by a belt to charge the 12V battery? Also, on the other side of the crank shaft there must be a timing belt to drive the camshafts right?
The 12V battery is charged by the DC-to-DC converter located inside the inverter-converter assembly. The converter is powered by the high-voltage battery.
Sangueffusor is right, there is no alternator. The 12V system is charged by a DC-to-DC converter. Yes, there are still timing belt(s) or chain(s) from the crankshaft to the camshaft(s). They are under protective covers on the engine. Thanks for your feedback!
So with the tank system now there is no longer pressure in the cooling system? Also dones not the heat exchanger on the transmission also help to heat up the transmission fluid quicker to reduce friction. Have noticed that my wife's new 2.4L accord that has one takes much longer to heat up the engine than my older 2.4 without on on its tranny. These may be why since not only the engine has to heat up.
There is still pressure in the cooling system. Yes, the heat exchanges on the transmission can also help it warm up more quickly. Thanks for your feedback!
Hi! I'm a big fan of your channel. THANKS for share your videos. I wanna ask from where you have the information of all the car, i mean, do you have the repair manual from toyota?
Prof. Good afternoon. @27:38, the “Brushless DC Water Pump” circulates the coolant fluid from the reservoir which cools the transmission then then inverter. I don’t have a scan tool to activate the pump. My workaround is to top it off, turn on the car, put in drive then place in park and check the level until the fluid level is at the reservoir line. I have a 2015 Fusion Energi, I still bring my car for the service check ups but with the duration between service intervals I have noticed that the reservoir gets low. Is this ok as long as I don’t over service the reservoir? Is there another way of servicing this unit without having to purchase an activation tool? Also I am not sure if you have discussed the reason why there are “Brushed and Brushless DC Motors?” Is it because of the need for “Potentimeters” on the Brushed DC units? For example the variable louvered inlet which limits the airflow when needed. Or is it just what the engineers added? The Hybrid vehicles are fun to work on but I limit myself to the basics due to lack of additional computerized tooling required. Thanks again for your help. Reg
That is amazing that a little grill shutter motor and sensor get their own microprocessor and thrown on the CAN bus. Dare I ask where you get information like "26 pieces of data..." from? I would guess that how all the modules communicate and what data they swap back and fourth is proprietary to Toyota and they don't want to share that? So with that information it seems you could connect to the CAN bus(es) and have fun with your car there, open/close vents and who knows what else? Are things like power mirrors, windows, headlights, etc on the CAN bus too? That is just amazing, thank you for the interesting video!
Thank you! Many of those items are on CAN busses now. I get my information from the service manuals. Toyota publishes a "New Car Features" supplement with all the cool technical details you would not normally find in the service information. Of course it is not free, you have to purchase it. Everything I have shared is available for anyone to purchase from Toyota. I read the information and summarize it in my own words in my videos. The 26 pieces of data I referred to can be read using a Toyota Techstream scan tool. Thanks for your feedback!
jontscott almost every little gadget is on the CAN bus these days. I, as an automotive technician, love that. Because I can actuate and test all these things with a click of a button on the computer. Makes diagnosis so much easier.
I guess I need to get a newer car so I can have more CAN bus around me :-) My '05 has CAN bus but nothing fun to control like lights, mirrors, fans, etc... just critical drive stuff.
jontscott you lucky guys with your fancy OBD-II systems! My family car is stuck in the world of OBD-II, and I'm stuck trying to find the equipment for it, for a reasonable price 😂
Professor I have a question if I may. On the bottom of the Transmission where you have it labeled "Fluid Drain Plug" is for draining the Transmission Fluid? It does not specifically say so I wanted to ask. Also should I use ATF-WS Toyota Fluid I have a 2020 Prius Prim? Thanks
Thank you for this educational video, I've recently got a 2020 Camry Hybrid and it's pretty similar to this model. I've got an off topic question about the vehicle approaching speaker. Is there a way make it louder with toyota techstream? Best regards from Austria
Sir. Any idea if these pumps and fan motors are brushed or brushless? Thanks Sir. You make great videos for us learning engineers to reference to. Awesome Stuff!!
Great video as usual. Thanks for sharing your knowledge. Potentially stupid question. What is the need for the mechanical thermostat on the ICE's electric water pump? Couldn't they just turn the pump on and off based on temperature sensor readings? Maybe they use it to allow flow through the 3 different paths?? It just seems like a potential waste of electric power for the pump to be running it all the time. Do you have any idea how much power that pump consumes?
Great question! The water pump is a variable speed brushless DC motor. Its rotational speed is independent of engine rpm now, so it actually reduces frictional losses that occur in belt-driven water pumps. The pump does not run constantly, its speed is based upon several factors (engine temperature, vehicle speed, and engine speed). I do not know how much current it draws, but the wires that feed it are pretty small. I will try to find out. Best wishes.
I can't believe that it took until 2021 to get an automaker to install a heat pump instead just a plain AC system on their cars. this means that the engine does not have to provide heat to the cabin unless its really cold out, and thus, can operate more efficiently.
As always a perfect presentation I did have a question what is the voltage of the AC compressor motor - also would you know the voltage of the AC compressor on a Panamera Hybrid? Many Thanks Mike
Thank you so much for teaching me about this cooking system! I have a question for you, I’m hoping you can help me. I know for fact my car has a problem within the cooling system. I checked for leaks, checked the engine oil appearance and level, checked the engine coolant level and checked the radiator and hoses and all this looks good to me. Now the car did overheated a week ago and melted the coolant filler neck that holds the radiator cap. Which I already replaced with a new one as well as the radiator cap. And The car engine runs ok for a short period of time but then the engine starts shaking making a sound like a broken or damage propeller and then the sound stops and the engine goes to running normal again. It’s now giving me any codes only the regular maintenance witch i’ve done. My question is, Do you know what could be making the engine to shake significantly do to something wrong in the cooling system? The engine side of the cooling system. Thank you for any information you can give me!! I greatly appreciate it!!
Does the Auris Hybrid 2017 have the same feature regarding preheat of ICE through the exhaust system? I have often wondered how it heats up the cabin so fast. Thanks for all the great videos.
Yeah it's going to be great one day you talk about GMC trucks you can hybrids about charging systems I understand this dcdc but I don't know where it's location
Hi Professor Kelly thank you for your most informative videos esp on toyota hybrid vehicles. I am driving a Toyota fielder station wagon 1.5 hybrid here in Singapore , vehicle registered on Feb 2015 and seek your advice if there is any further modification to the current auto transmission oil cooling system by retrofitting an aftermarket oil cooler radiator coil?
Hi Professor, I own a Prius Prime, and I think that this car you are working on. You called it an eco, and the car looks exactly like mine. Question, the coolant reservoir on the left keep emptying and I have steam or a mix of fuel and or oil, I’m not sure what it is exactly. Just billows of white thick smoke/steam but it lingers in the air. Toyota near me is unable to figure out what is wrong. They say the cylinders are holding pressure and there are not signs of burning coolant. The car seems to run fine...it’s just smoking and the coolant constantly drains within miles. Can you direct me to someone who can fix it for me? Toyota dealership near doesn’t know what’s wrong. Thanks for making this video. I really enjoy this vehicle. It is very reliable and is actually pretty quick in traffic. I made the mistake of seeing how long I can go on an oil change using Lucas synthetic oil stabilizer, 40k, but I’ll never do that again. I also only use non-ethanol fuel. I also decided to put in a K&N air filter on it and the engine just purrs. Even more quiet than it is stock and Toyota really did a great job on engineering these cars. The best Prius I have ever had the pleasure to drive and with a full charge and my additions, I used to get 72 mpg. Now though after 133k miles, I need to replace spark plugs and get it serviced. Thanks.
This one is not the Prime. That issue sounds pretty serious. The exhaust heat recovery system could be leaking exhaust into the cooling system causing that problem. Your coolant is probably going out the exhaust pipe. See th-cam.com/video/LTxGlUDcTDs/w-d-xo.html
I’ll never buy EV until I’m forced to. I’m a boomer and like the Professor, proud of it. If I’m gonna pay more than $60K for a vehicle to get me to work it better have more than 100 mile range in the winter.
Professor Kelly thank you for such a detailed description Can you please let us know why would Toyota use fans moving in opposite direction considering these will create more complex inventory management of 2 different parts that could be just one. There must be some technical requisite behind that. Thanks in advance.
Thank you for your videos professor. I am enjoying them a lot. I have got a first gen 5 year old Chevy Volt and I am wondering maybe once you will make a video about the Volt's cooling system too. Till then I want to ask you what will happen if I won't change the cooling fluid of my battery and inverter. Some owners says we don't really need to change it since the cooling fluid is preserved in the cooling system even in better conditions then in the shop's store. I know that service manuals recommend it to change it after 150,000 miles or 5 years, but mine has only 100,000 miles on it. Will it damage my batteries if I won't change it until I get 150,000 miles?
Thank you! I am planning on making a cooling system operation video for the 2nd generation Chevrolet Volt as well as battery operation and service and transaxle operation and service. I will be sure to point out what has changed verses the first generation Volt. Changing the coolant before 150,000 miles will not hurt the system as long as it is done properly. I do not recommend that you try to replace the coolant in your battery yourself unless you have he proper training and tools. The procedure requires a scan tool to activate fluid pumps and disable the coolant heater and chiller. It also requires disconnecting a coolant hose at the battery. It is a big job that must be done correctly or damage to the battery and vehicle can result. I hope that helps.
Yes I know only authorized services can do it. That is my problem in fact because here in Europe don't really have such services and the closest is very far away from my home (more then 500 miles away). So I wanted to know if it will be a problem if I will change the cooler 2 or 3 years later when I get closer to 150,000 miles. Maybe till then will open some sevices closer to my home. Will it damage my batteries if the cooler will be older then 5 years but the mileage will be less than 150,000 miles?
I misunderstood your question. No, It will not hurt anything as long as the coolant has not darkened. Normally it is a bright orange color. Best wishes
Thank you professor. It has perfect orange color. You helped me a lot. I am looking forward to see your new video about the 2nd gen Volt. It is unbelievable how much GM reduced the electric motors size and weight. I wonder why it was so huge in the 1st gen Volt. They find some kind of new technology to build an electric motor with less permanent magnets? Those two motors are less weight and size then the B motor in the 1st gen which we could see in yours video is very very heavy.
The first generation Volt transaxle is actually a modified version of an extremely rare (one year only) 2009 Saturn Vue Hybrid (MK3 option code) 2MT70 Transaxle. The Saturn 2MT70 transaxle only had 2 modes rather than four, but it looks almost exactly the same internally and externally as the Volt's 4ET50 4 mode transaxle. It was an old heavy design when they put in in the Volt.
Professor Kelly, I have a question relating to coolant draining and bleeding procedure for a 2010 Prius base model. My local dealer in northern Virginia charges $200 to change the engine coolant and $200 to change the inverter/converter coolant. I'd like to do it myself. I haven't been able to locate any solid videos and/or instructions on how to do both properly. Based on watching this video of yours, which was incredibly well done, it concerns me that I don't have the proper professional level scan tool to force the water pump to the inverter to kick on to bleed it. If it wouldn't be too much of a bother for you, is it possible for you to recommend an educational source for a DIY mechanic showing how to change the engine and inverter/converter coolant and bleed both of them properly... without having to purchase a $20,000 Toyota scan tool? Many thanks professor. Regards, Steve.
Interesting So on this 2017 Toyota Hybrid (vid) car has a "here I am" sound speaker mounted in the front grill to make a noise at very slow speeds. The Hybrids are sneaky quiet but our 2017 Camry Hybrid SE as it slows down make an electric motor type sound ( I thought) as its producing electrical power for the traction battery.. When backing up after a few seconds the gas engine starts up (at least I think its the engine starting up?) Just took a look and didn't see.a speaker device near the drivers side horn similar to the one in the vid? Like everyone else appreciate the Professor Kelly Weber Auto vids. Note: Four yrs old and 0 problems of any sort. .
This video helped me solve my coolant heat exchange pipe issue that had became damaged from a road hazard. My shop didn’t know either. They gave me an atta-boy for figuring it out, but my thanks goes to you Sir. Thank you.
That is awesome! Good job
Professor Kelly, I like you voice, your deep knowledge, willingness to teach & share this knowledge : you are true inspiration to so many people : your teaching a blessing to the world : Cheers Buddy
Thank you very much!
Meg drives our 2005 Toyota Prius II with 138K+ miles : cut off the rear muffler ^^ Strong Hybrid
I drive our 2014 Honda CRz II with 17K+ miles : all OEM except LED's to replace halogen lamps : Weak Hybrid
We also use our 2013 Honda PCX150 scooter with its crank mounted alternator starter generator : Barely Hybrid
Meg & I also travel using Segway Minipro self-balancing personal mobility assist device : Fully Electric
Very rightly stated. I envy students who are taught by Professor.
Thank you SO much Professor John D Kelly for Producing, Editing and Narrating this fantastic series of educational videos.
This is the most informative automotive show ever, clearest photography, sound, explanations and nothing is hidden.
If I may say this, Professor Kelly you are an amazing person. Top marks. From the UK 🇬🇧🇺🇸.
Thanks for watching
Love these videos. Its clear enough for anyone to understand and goes deep enough so you know whats going on. Some asks whats regenerative breaking, someone might say well thats when a motor converts the energy from the wheels back to the battery. You know what were looking for, a simple but in depth explanation with the engine parts right there to show and demonstrate. Just awesome. Thank you sir.
I used to be a hybrid sceptic - I simply thought that the tech is not ready yet and that it was too complicated to be reliable. I have changed my mind after watching your explanation of Toyota`s HSD (eCVT) and eAWD.
My next car will be eCVT eAWD from Toyota. There are few models on Japanese market so the choice is here.
... saying that I do not understand why Toyota`s marketing team is hiding Harrier from the rest of the world. It is the "cheapest Lexus SUV" on the market. Has classic looks and makes a great SUV. It sells in big numbers on Japanese market. It is a true posh RAV4 ;)
Thank you so much for your work.
Thank you very much
The Lexus Harrier is called RX in other markets, a bit pricey compared to the new RAV4 hybrid:/
"I like to disassemble things that are not supposed to be disassembled" My man!
Thank you! It is a lot of fun (as long as I do not ruin the part).
That's what I do too with new "toys". Turn it on so I know it works before I thinker with it, then opening it up so I know how it works and finally put it back together. If it does not work anymore, then I know I did something wrong because I confirmed it worked before.
This is a fascinating tour and explanation of the vehicle’s cooling system professor Kelly. I enjoyed listening to your descriptions of the components. These cars are a marvel of technology. Thank you very much.
Being mostly focused on all-electric cars, I was not sure this video would have much relevance to my intended learning. But on thinking about it, I realize it's good to show me the complexity of ICE and hybrid vehicles.
An exhaust heat recirculation system? I Always learn something new from your videos. Thank you for sharing.
Thank you!
That definitely looked like a failure point to me, although the earlier Prius' have been much more reliable than I would've expected, so we shall see.
Love your in-depth work explaining the cooling system.
It is way to complicated more than it needs to be. But I understand how engineers think and work. They don’t teach simplicity in any engineering school. I would simplify the system by cooling the liquid by passing the liquid over a bismuth telluride plate, which uses only 0.70 of a DC amp. Eliminating compressor and more moving parts.
Please look it up. Heat is the enemy of all electrical systems.
Love your work!
Thermoelectric coolers are notoriously inefficient. To match up, it would need to be both big, and run at quite a high voltage, neither of which is very cheap compared to what they have here.
brilliant Professor , im a qualified mechanic , i don't deal with hybrids , i think i need to enrol on a hybrid course , thanks your knowledge is fantastic , you got me really interested , Thank you from UK
Great video as usual Professor Kelly. We are now familiarising ourselves with hybrids...........close to 3 years. Amidst the thousands of naysayers of Hybrid techno;ogy, Toyota Hybrid is No. 1 here in Trinidad & Tobago, West Indies. Thank you so much.
Great lesson Mr. Professor. I watch your videos regularly. Thank you from Bangladesh. Carry on.
I bought a 2024 Corolla hybrid and would really like to see a video on the pedestrian warning speaker and my options to disable or change the annoying spaceship sound without throwing a code. I know you briefly mentioned this in the video. Hoping to find a solution.
Thank you for another great video, Sir
Thanks
Thank you very much!
Excellent Stuff As usual Professor Kelly. We Are so great-full for your kind efforts to impart knowledge to millions around the world.
Thank you very much!
There is alot going on here very complicated, wouldnt want to drain all that coolant and replace it at the specified interval. Great video!
Thank you!
A fascinating video on learning (in depth) the way cooling systems are on modern hybrids vs traditional combustion engine cooling systems. Didn't know there were 2 separate water pumps, that there is so many hoses/circuits in that one radiator, etc.
I would thank you quite much for your help us , and I feel you are doing an arduous job for us giving precise knowledge about automobile technology ( such as Hybrid systems ) , and I would like fervently request you that if we can learn about automotive air conditioning systems from you we can repair those more confidently, because of your precise theories. thank you very much,,,, !
Thank you very much! I am planning on covering Hybrid HVAC systems in the future.
Man, You are good at describing it all! You know your stuff for sure.
Thank you Professor, this is really very a complex cooling system.
Thank you! It certainly is. It took me a while to get it all figured out.
thank you for sharing this info with the world! an excellent teacher that should be rewarded for all his hard work!!
Thank you very much!
It's very interesting with all the detailed design at this complex cooling system for the internal combustion engine and the hybrid inverter, Toyota left the two hoses for the exhaust heat recirc system fully unshielded, especially when they run the entire length of the very hot 2nd catalytic converter. These hoses will probably spring a leak with high mileage cars.
Thanks for your feedback. The second catalytic converter has an external shield around it by the coolant hoses for the exhaust heat recirculation system. The system uses stainless steel pipes up a little further above the catalytic converters and the exhaust manifold. The hoses are only used where there is powertrain flexing. Have a good day!
The transaxle cooling system is quite robust when compared with the Gen 3 unit. I can see why they allow towing in some markets now. I've towed up to 1100 lbs with my 2010 while observing temps on MG1&2 and the inverter coolant temp to be well within standards. Great video as always.
Thank you! I had heard that towing was allowed in some markets. I wonder what the maximum gross combined vehicle weight rating (GCVWR) is.
WeberAuto According to a British car publication the Gen 4 is rated for 725 kg (1,598 lbs) in Europe. I've heard the Gen 3 was rated for towing in Europe also though I could not verify limits. Not sure if Toyota NA recommends towing for Gen 4 units sold here. Small teardrop shaped Travel trailers are very popular in Europe, I can imagine the Prius is well suited for that.
Creig Mac were you able to observe the transmission temperature as well? I have a 2018 Highlander hybrid that I plan to use for towing a 1200 lb trailer. I can’t find an OBD 2 scanner that will show the transmission temperature. Thanks
Excellent presentation as always. I learned a great amount of very useful information on this new generation of Prius.
The post 2010 Prii have two disadvantages. One is the expensive to replace electric water pump. The second is the hard to service EGR valve. That's why I nominate the GEN 2 as the Prius you can keep cheap for 20 years. The taxi drivers here in San Diego buy old GEN 2s at 100k + and drive them to 400k. The old mechanical water pumps go over 150-200k and there is no EGR valve. The only GEN 2 problems seem to be the 2 Way hot-water valve and the inverter water pump that was on a recall. That pump was redesigned from a one bearing to two bearings on the shaft. Besides the cat going out at 150-200k and in Calif requiring an OEM cat at $1300-2000, the GEN 2 is bulletproof. As a bonus, the GEN2 had an available JBL audio system that beat the pants off the GEN 3 & 4 audio systems. And of course, you can easily service the main battery modules. Toyota will sell you a new battery you can install yourself for $1950 plus a $1300 core charge. Try that with a Prius Prime LION battery. The 2016 up Prii are great until the battery warranty expires. What is the resale value if the battery goes out? What is a dead Tesla worth? Not much.
Great information, thank you!
Excellent description! I never knew the Prius has a 2 part radiator.
Our Fiat 500e has 2 coolant loops, one for the battery and one for the battery charger, inverter / converter, and traction motor. The battery loop has it's own small radiator mounted in front of the ac condenser, and includes a 6kw heater and r134a heat exchanger so that the evecu can both cool and heat the battery. The other loop uses what looks like a normal 500 radiator mounted behind the condenser.
The cabin heat is from a PTC element, there is no water heater core.
Thank you and thanks for the description of the cooling/heating systems on your 500e. Almost every EV I have seen have similar systems. I will be doing similar videos on the Chevrolet Bolt and Volt in the near futures.
WeberAuto I’m looking forward to those videos!
Great info Professor, thank you! It's scary how many intricate moving parts are under a vehicle open to road grime and splatter. Thinking too how the salt and sand/dirt on the roads will interfere with the long term operations of these parts. Really have to question where the "technology meets the road" so to speak is really a "head on collision".
Thank you! They have been surprisingly reliable over the years. Of course any contact in any type of collision will cause $$$ damage.
I meant that the "technology" and the "road" so to speak collide. :
Thanks for your effort. A schematic diagram of the entire cooling system showing all components in separate loops for ICE & Electrics would be helpful. At 3:07 - the pins protruding from the electric water pump housing are an omnidirectional heat sink; a conical shape is actually the most efficient. I thought it was very strange to have a thermostat on the return line FROM the radiator; I would assume this is where the exhaust and EGR loops mix in, (?)
Looks like Iv'e found a set of videos that are definately worth watching. Thanks for real entertainment!
I am hooked on your channel. You are great teacher
Thank you! 😃 Thanks for watching
Toyota sold me a Toyota long life concentrated fluid, I will check with them again if it’s compatible. Thanks for a great detailed video. Very informative
always learn a lot from you thanks for share your knowledge. greetings from central america costa rica.
Thank you! very much!
Brillante explicación! No me perdi nada (master class )!! Gracias!!
感恩了解，謝謝分享！
I enjoyed it an learned a lot. Thank you again for making and sharing this John Kelly.
Thank you!
Thanks for your explaining how cooling system Hybrid
works.
Thank you!
It's good for new learner.
God bless you sir for helping me understand what is going on
Man I love this guy!
Professor Kelly, you’z da man.
Keep on keeping on my good friend!
your school teach more in deep but here los angeles trade tech college they teach the basics with your videos im learning more
Thank you!
Good video, great explanation. I like Your videos. Greetings from Europe, Hungary
Thank you!
Hi Sir ,,Your all videos very informative thank u Sir,love from pakistan......
I didn't hear you mentioning the inverter cooling pump assembly. I believe it is visible below the inverter inlet and outlets. It looks like it's readily accessible and easily replaceable from underneath the vehicle.
Professor Kelly, excellent videos. Thank you.
You're very welcome!
Ill have to watch this vid a few times to get it all... What a great vid... Thanx professor
Thank you!
I always learn a lot from your videos. Thank you Professor!
Thank you!
Awesome Professor, great explanations
Thank you Professor..hope you can do a study on Prius HVAC in future.
Thank you! That is on my list of things to do.
Excellent video. Been watching your channel for years. Keep em coming. Thx! 👌
Thank you for your support! I will!
So amazing. Thanks so much for your wonderful work professor!
Thank you!
Very comprehensive.. thank you 👍
Question...Do I need to flush the system? Or is draining and replacing adequate?
Thanks Professor Kelly. Ramish.
Thank you very much
Loved every second of it!. I would like to work on electrical cars
Que aula maravilhosa! Parabéns pela dedicação!
Thank you!
This is the first time I've ever seen a thermostat on a coolant inlet, usually they're on the outlet to the radiator. Is there a reason the thermostat is on the inlet in this case?
Electric water pump can control the flow better
This information is fantastic , thank you so much Sir.
Again wonderful explanation..thank you very much
Thank you!
Thank you for the video. I was hoping that you would also explain how the heater for the interior work when the engine is not running. Or is it something you explain in a separated video?
Thank you for sharing your videos!
Thank you!
thank you Professor :)
Thank you!
Great info Professor, thank you.
Those two cats are going to cost big bucks in Calif where no aftermarket cats are available or legal. On the 2016 up Prii, I would only keep the car until the warranty expired and I would make sure I got the additional Toyota Platinum warranty. I think you can still buy the Toyota warranty up until the first year of ownership and you don't have to buy it from the selling dealer. On my 2005, I bought a 7 year warranty for $1000 but not from my San Diego dealer. I got a deal from a Toyota dealer in Rexburg, Idaho!
Thanks for your feedback! Good idea about the Toyota extended warranty purchase
Professor can I have a question? I understand there is no V-belt to drive the water pump nor the AC compressor as you have shown in the video. Is there a generator/alternator which is driven by a belt to charge the 12V battery? Also, on the other side of the crank shaft there must be a timing belt to drive the camshafts right?
The 12V battery is charged by the DC-to-DC converter located inside the inverter-converter assembly. The converter is powered by the high-voltage battery.
Sangueffusor is right, there is no alternator. The 12V system is charged by a DC-to-DC converter. Yes, there are still timing belt(s) or chain(s) from the crankshaft to the camshaft(s). They are under protective covers on the engine. Thanks for your feedback!
So with the tank system now there is no longer pressure in the cooling system? Also dones not the heat exchanger on the transmission also help to heat up the transmission fluid quicker to reduce friction. Have noticed that my wife's new 2.4L accord that has one takes much longer to heat up the engine than my older 2.4 without on on its tranny. These may be why since not only the engine has to heat up.
There is still pressure in the cooling system. Yes, the heat exchanges on the transmission can also help it warm up more quickly. Thanks for your feedback!
I think the radiator grill shutter system may be utilized to improve overall gas mileage during winter driving condition.
Yes, it will help keep the coolant from losing heat
Hi! I'm a big fan of your channel. THANKS for share your videos. I wanna ask from where you have the information of all the car, i mean, do you have the repair manual from toyota?
Prof. Good afternoon. @27:38, the “Brushless DC Water Pump” circulates the coolant fluid from the reservoir which cools the transmission then then inverter. I don’t have a scan tool to activate the pump. My workaround is to top it off, turn on the car, put in drive then place in park and check the level until the fluid level is at the reservoir line. I have a 2015 Fusion Energi, I still bring my car for the service check ups but with the duration between service intervals I have noticed that the reservoir gets low. Is this ok as long as I don’t over service the reservoir?
Is there another way of servicing this unit without having to purchase an activation tool?
Also I am not sure if you have discussed the reason why there are “Brushed and Brushless DC Motors?” Is it because of the need for “Potentimeters” on the Brushed DC units? For example the variable louvered inlet which limits the airflow when needed. Or is it just what the engineers added?
The Hybrid vehicles are fun to work on but I limit myself to the basics due to lack of additional computerized tooling required.
Thanks again for your help. Reg
That is amazing that a little grill shutter motor and sensor get their own microprocessor and thrown on the CAN bus. Dare I ask where you get information like "26 pieces of data..." from? I would guess that how all the modules communicate and what data they swap back and fourth is proprietary to Toyota and they don't want to share that? So with that information it seems you could connect to the CAN bus(es) and have fun with your car there, open/close vents and who knows what else? Are things like power mirrors, windows, headlights, etc on the CAN bus too? That is just amazing, thank you for the interesting video!
Thank you! Many of those items are on CAN busses now. I get my information from the service manuals. Toyota publishes a "New Car Features" supplement with all the cool technical details you would not normally find in the service information. Of course it is not free, you have to purchase it. Everything I have shared is available for anyone to purchase from Toyota. I read the information and summarize it in my own words in my videos. The 26 pieces of data I referred to can be read using a Toyota Techstream scan tool. Thanks for your feedback!
jontscott almost every little gadget is on the CAN bus these days. I, as an automotive technician, love that. Because I can actuate and test all these things with a click of a button on the computer. Makes diagnosis so much easier.
I guess I need to get a newer car so I can have more CAN bus around me :-) My '05 has CAN bus but nothing fun to control like lights, mirrors, fans, etc... just critical drive stuff.
jontscott you lucky guys with your fancy OBD-II systems! My family car is stuck in the world of OBD-II, and I'm stuck trying to find the equipment for it, for a reasonable price 😂
WeberAuto I don't even own a Toyota, but now I'm curious. How much do they cost?
Amazing videos. Thank you
Glad you like them!
Professor I have a question if I may. On the bottom of the Transmission where you have it labeled "Fluid Drain Plug" is for draining the Transmission Fluid? It does not specifically say so I wanted to ask. Also should I use ATF-WS Toyota Fluid I have a 2020 Prius Prim? Thanks
Thanks to share your know-how to us, it's Very good
Thank you!
Thank to your video I help my boss not to replace the electric water pump I just removed the plug clean it and replace it and it work
Another great video, thanks again
Thank you
Thank you for this educational video, I've recently got a 2020 Camry Hybrid and it's pretty similar to this model. I've got an off topic question about the vehicle approaching speaker. Is there a way make it louder with toyota techstream? Best regards from Austria
Sir. Any idea if these pumps and fan motors are brushed or brushless? Thanks Sir.
You make great videos for us learning engineers to reference to. Awesome Stuff!!
They are two-wire brushed DC motors, Thank you!
Thanks Prof!
Thank you, this is so amazing!
Thank you!
@@WeberAuto how to converts ac
Great video as usual. Thanks for sharing your knowledge.
Potentially stupid question. What is the need for the mechanical thermostat on the ICE's electric water pump? Couldn't they just turn the pump on and off based on temperature sensor readings? Maybe they use it to allow flow through the 3 different paths?? It just seems like a potential waste of electric power for the pump to be running it all the time. Do you have any idea how much power that pump consumes?
Great question! The water pump is a variable speed brushless DC motor. Its rotational speed is independent of engine rpm now, so it actually reduces frictional losses that occur in belt-driven water pumps. The pump does not run constantly, its speed is based upon several factors (engine temperature, vehicle speed, and engine speed). I do not know how much current it draws, but the wires that feed it are pretty small. I will try to find out. Best wishes.
I can't believe that it took until 2021 to get an automaker to install a heat pump instead just a plain AC system on their cars. this means that the engine does not have to provide heat to the cabin unless its really cold out, and thus, can operate more efficiently.
The 2011 Nissan Leaf had a heat pump. they are used by several vehicle manufacturers now. Thanks for watching
Thank you Sir for the good work.
Thank you!
I like the way John chuckles when he comes across something ironic like the number of coolant hoses attached to the radiator 😂🥴
LOL, Thanks for watching
As always a perfect presentation I did have a question what is the voltage of the AC compressor motor - also would you know the voltage of the AC compressor on a Panamera Hybrid? Many Thanks Mike
Thank you so much for teaching me about this cooking system! I have a question for you, I’m hoping you can help me. I know for fact my car has a problem within the cooling system. I checked for leaks, checked the engine oil appearance and level, checked the engine coolant level and checked the radiator and hoses and all this looks good to me. Now the car did overheated a week ago and melted the coolant filler neck that holds the radiator cap. Which I already replaced with a new one as well as the radiator cap. And The car engine runs ok for a short period of time but then the engine starts shaking making a sound like a broken or damage propeller and then the sound stops and the engine goes to running normal again. It’s now giving me any codes only the regular maintenance witch i’ve done. My question is, Do you know what could be making the engine to shake significantly do to something wrong in the cooling system? The engine side of the cooling system. Thank you for any information you can give me!! I greatly appreciate it!!
Thank your for these videos.
Does the Auris Hybrid 2017 have the same feature regarding preheat of ICE through the exhaust system? I have often wondered how it heats up the cabin so fast. Thanks for all the great videos.
I do not know, I suspect it does. Thank you!
Thank you tremendous video!
Yeah it's going to be great one day you talk about GMC trucks you can hybrids about charging systems I understand this dcdc but I don't know where it's location
Hi Professor Kelly thank you for your most informative videos esp on toyota hybrid vehicles. I am driving a Toyota fielder station wagon 1.5 hybrid here in Singapore , vehicle registered on Feb 2015 and seek your advice if there is any further modification to the current auto transmission oil cooling system by retrofitting an aftermarket oil cooler radiator coil?
No wonder Toyota makes these cars so reliable. They would go broke paying their technicians under warranty.
Thanks for your feedback!
Please explain battery cooling when you get a chance.Thanks
Hi Professor, I own a Prius Prime, and I think that this car you are working on. You called it an eco, and the car looks exactly like mine.
Question, the coolant reservoir on the left keep emptying and I have steam or a mix of fuel and or oil, I’m not sure what it is exactly. Just billows of white thick smoke/steam but it lingers in the air.
Toyota near me is unable to figure out what is wrong. They say the cylinders are holding pressure and there are not signs of burning coolant. The car seems to run fine...it’s just smoking and the coolant constantly drains within miles.
Can you direct me to someone who can fix it for me? Toyota dealership near doesn’t know what’s wrong.
Thanks for making this video. I really enjoy this vehicle. It is very reliable and is actually pretty quick in traffic. I made the mistake of seeing how long I can go on an oil change using Lucas synthetic oil stabilizer, 40k, but I’ll never do that again. I also only use non-ethanol fuel. I also decided to put in a K&N air filter on it and the engine just purrs. Even more quiet than it is stock and Toyota really did a great job on engineering these cars. The best Prius I have ever had the pleasure to drive and with a full charge and my additions, I used to get 72 mpg. Now though after 133k miles, I need to replace spark plugs and get it serviced.
Thanks.
This one is not the Prime. That issue sounds pretty serious. The exhaust heat recovery system could be leaking exhaust into the cooling system causing that problem. Your coolant is probably going out the exhaust pipe. See th-cam.com/video/LTxGlUDcTDs/w-d-xo.html
I’ll never buy EV until I’m forced to.
I’m a boomer and like the Professor, proud of it.
If I’m gonna pay more than $60K for a vehicle to get me to work it better have more than 100 mile range in the winter.
Professor Kelly thank you for such a detailed description
Can you please let us know why would Toyota use fans moving in opposite direction considering these will create more complex inventory management of 2 different parts that could be just one.
There must be some technical requisite behind that.
Thanks in advance.
Thank you. I do not know the reason
For whatever reason we don't have the exhaust heat recirculation system in European Priuses. Always wondered why they was that radiator there.. thanks
keep up the good work, thank you ...
Thank you!
Hi Professor, I like the way you explained the Toyota hybrid system. Could you please explain for Hyundai IONIQ Hybrid.
I hope to someday.
Thank you!
"Cool" info Professor! Many areas for leaks, when it happens.
lol, yes! Thank you!
thanks for video. what is the reason of fans running in two different direction. how coolant in the radiator cools off
Probably helps with vibrations and noise... Also may help with airflow.. having the air swirl in different directions may help with those issues.
You mentioned scan tool commanding of the shutter actuator. Are PIDs for that freely available?
Good question, I do not know. I doubt it.
Thank you for your videos professor. I am enjoying them a lot. I have got a first gen 5 year old Chevy Volt and I am wondering maybe once you will make a video about the Volt's cooling system too. Till then I want to ask you what will happen if I won't change the cooling fluid of my battery and inverter. Some owners says we don't really need to change it since the cooling fluid is preserved in the cooling system even in better conditions then in the shop's store. I know that service manuals recommend it to change it after 150,000 miles or 5 years, but mine has only 100,000 miles on it. Will it damage my batteries if I won't change it until I get 150,000 miles?
Thank you! I am planning on making a cooling system operation video for the 2nd generation Chevrolet Volt as well as battery operation and service and transaxle operation and service. I will be sure to point out what has changed verses the first generation Volt. Changing the coolant before 150,000 miles will not hurt the system as long as it is done properly. I do not recommend that you try to replace the coolant in your battery yourself unless you have he proper training and tools. The procedure requires a scan tool to activate fluid pumps and disable the coolant heater and chiller. It also requires disconnecting a coolant hose at the battery. It is a big job that must be done correctly or damage to the battery and vehicle can result. I hope that helps.
Yes I know only authorized services can do it. That is my problem in fact because here in Europe don't really have such services and the closest is very far away from my home (more then 500 miles away). So I wanted to know if it will be a problem if I will change the cooler 2 or 3 years later when I get closer to 150,000 miles. Maybe till then will open some sevices closer to my home. Will it damage my batteries if the cooler will be older then 5 years but the mileage will be less than 150,000 miles?
I misunderstood your question. No, It will not hurt anything as long as the coolant has not darkened. Normally it is a bright orange color. Best wishes
Thank you professor. It has perfect orange color. You helped me a lot. I am looking forward to see your new video about the 2nd gen Volt. It is unbelievable how much GM reduced the electric motors size and weight. I wonder why it was so huge in the 1st gen Volt. They find some kind of new technology to build an electric motor with less permanent magnets? Those two motors are less weight and size then the B motor in the 1st gen which we could see in yours video is very very heavy.
The first generation Volt transaxle is actually a modified version of an extremely rare (one year only) 2009 Saturn Vue Hybrid (MK3 option code) 2MT70 Transaxle. The Saturn 2MT70 transaxle only had 2 modes rather than four, but it looks almost exactly the same internally and externally as the Volt's 4ET50 4 mode transaxle. It was an old heavy design when they put in in the Volt.
Professor Kelly, I have a question relating to coolant draining and bleeding procedure for a 2010 Prius base model. My local dealer in northern Virginia charges $200 to change the engine coolant and $200 to change the inverter/converter coolant. I'd like to do it myself. I haven't been able to locate any solid videos and/or instructions on how to do both properly. Based on watching this video of yours, which was incredibly well done, it concerns me that I don't have the proper professional level scan tool to force the water pump to the inverter to kick on to bleed it. If it wouldn't be too much of a bother for you, is it possible for you to recommend an educational source for a DIY mechanic showing how to change the engine and inverter/converter coolant and bleed both of them properly... without having to purchase a $20,000 Toyota scan tool? Many thanks professor. Regards, Steve.
Interesting So on this 2017 Toyota Hybrid (vid) car has a "here I am" sound speaker mounted in the front grill to make a noise at very slow speeds. The Hybrids are sneaky quiet but our 2017 Camry Hybrid SE as it slows down make an electric motor type sound ( I thought) as its producing electrical power for the traction battery.. When backing up after a few seconds the gas engine starts up (at least I think its the engine starting up?) Just took a look and didn't see.a speaker device near the drivers side horn similar to the one in the vid? Like everyone else appreciate the Professor Kelly Weber Auto vids. Note: Four yrs old and 0 problems of any sort. .
Thanks for watching