I love the way you break down your explanation of all things auto-mechanical, however if you would just do a normal voice over it would make your videos sooo much better.
Holy cow! The audio explanation makes this simple device sound very complicated! If you just look at the animated diagram, the operation becomes very clear.
It's not that it's more expensive, it's that it is a newer technology. But you'd be amazed at how many cars are now using this latest AC development. Often times they don't even advertise it because folks don't know much about AC systems, so it'll just confuse the public, but it's there. Yesterday I saw a tiny KIA with GDI or gasoline direct injection (just finished the series for that) and I was shocked. So look close next time. It may have a VD compressor. Thanks
2012 kia optima clutchless compressor....cold air only when revving rpms up to 2500 rpm...low pressure side is high at idle and warm air out of vents....raise rpms and it lowers but is still high and air is cold out of vents...bad solenoid valve? Maybe sticking and not opening all the way? When rpms increase it spins more but displacement never gets biggers because solenoid valve is not letting it?
I have this Sanden in my 2008 VW Rabbit Mk 5 and I love it! With over 157K miles on it, the system has been trouble-free. However, the OEM solenoid was not a good design and did not allow the compressor to cool fast enough or cool enough. I replaced it with an upgrade RKX AC Compressor Control Valve Solenoid which makes it work perfectly, faster and cooler. I do have one question: What controls the coolant temperature, fan speed? If I want it to be less cool with the fan at low, I can only add warm air to it. Great video!
Although the compressor has a low internal failure rate due to continuous internal lubrication, the pulley bearings stil fail. Unfortunately most manufacturers don't sell the pulley bearing separately forcing people to buy the whole compressor. These compressors can be double what common clutched compressor cost.
Amalgamous Proxy Thanks for sharing. You might be able to get the bearing from the bearing manufacturer. There are not that many of these around, but it might take some research to find them.... www.autodiagnosticsandpublishing.com/auto_repair_equipment_catalog.html
Trust me, let it run without refrigerant (what happens when the AC system has a leak and the owner just doesn't care about it and lets it run dry), rev it, and the compressor seizes. No refrigerant means no lubricant flow across the system and whatever is left inside the compressor either gets pushed out (remember, no VDC can ever reach absolute 0% displacement; if that were to happen, you'd need to tear it up to bring the pistons back into stroke) or carbonizes pretty soon due to the intense frictional heat. A clutch equipped VDC is much much more reliable than this stuff.
Questo procedmento si adottava gia' trenta anni orsono negli essiccatori dell'aria compressa. Quelli costruiti negli anni 60 ancora funzionano. Il problema e' solo quello che oggi non ce' piu' il tempo per formare professionalmente il personale, quindi speriamo che il concetto dia buoni risultati nel tempo.
2014 kia rio. idling in a desert summer, above 100°F. i have to pump the gas pedal to rev up the engine, to get colder air . otherwise, the ac air at idle (in a triple digit ambient temp) is only cool but not cold enough to relieve. never had such a problem with a 2004 pontiac that used a clutching ac compressor.
Would this be the same style thats in a clutchless Denso ac compressor? I just found out my 2010 Corolla has a clutchless compressor. I never heard of them before. Thanks.
I have a question. In cars with variable displacement compressors, it is supposed that the compressor is operating as long as the car motor is rotating. So, what does exactly pressing the AC switch button do in this case?
CONTINUED FROM 1: The end result is that at the expansion valve outlet, there's cold refrigerant but enough to cool a lower volume if passing air through the evaporator. This is that same as cycling the old style compressor clutch, but much more efficient. Pressures should remain at the standard or around 39 PSI low and about 250 PSI High. Fluctuation may change a bit of course, but that's the rule of thumb for r134 and even the older r12. Makes sense?
WOnderful, wonderful. Thanks again Mandy! I do have a question - with this approach to an AC compressor - I wonder why more automobiles don't use this type of system? Even today - we still see the typical electromagnetic clutch on belt-driven compressors. It it more expensive for this option?
hi, i have the same system in my mercedes w203, the compressor dosent boost the gas, so i opened it and look inside, nothing special, it will be the electro valve faulty? what you suggest? thanks a lot :-)
Wow!!! Engine piston propulsion and flywheel rotation should be made and designed this way!! Im calling up Toyota right now! Why didnt you show me this design earlier 9 yrs ago?
Hi, what is the relation to crank case pressure to suction or discharge pressure. In non variable ac compressor, I understand suction and discharge. I am not able to relate to crank case pressure. What is this pressure and how is it related.
Even if there's no refrigerant at all some oil may remain inside the compressor's crankcase and keep things lubed up (albeit very noisily) until you forcefully rev the engine. If it gets revved up too much, the oil can get pushed away inside the discharge piping and leave things inside unlubed, or heat up too much due to the intense friction (with a proper refrigerant charge, the compressor's internals are cooled down by the cold suction gas; keep in mind that some friction is always there even if it's at minimum stroke because minimum stroke is NEVER 0 stroke) and degrade into something that no longer functions as a lubricant. That's when everything seizes up. These compressors don't have a sump and a dedicated oil pump unlike what you find inside, for example, a Valeo TM-31.
The pressure relation is the same. At lower strokes mode the compressor will just be pumping LESS refrigerant, due to lower demands of course. Keep in mind that even if the displacement is lower, AC compressors pump LIQUID, which can not be compressed. You can compress a gas, but the liquid VOLUME stays the same even though it's pressurized. At lower strokes, the compressor is still pumping liquid, but at lower volumes and lower stress on the engine. CONTINUED 1
Oh sorry - I was a bi it off. I meant that, you said that it was developed in 1985 - yet I see 2000+ cars that still use an EM clutch (mine included). Mostly was wondering why it took 20 years to catch on.
No, that's not what the video says. If you loose charge, the swashplate inclination goes to nothing or zero angles. The compressor keeps turning, but the piston stroke is none-existent. For all practical purposes, the only components turning are the pulley and shaft. These get lubricated anyway from the circulating oil and the oil inside the compressor. Makes sense?
Ramil Fajardo See if the engine dies when you slightly accelerate the engine and turn the AC on. If it does or it makes noises then the AC comp is seized. More than likely it is the IAC or the ETC system.
I think this design will vibrate more due to an unbalanced mass rotating causing fatigue failure in the parts as well as efficiency loss. This is the trade-off for the benefits.
As far as I am aware rotating mechanical devices experience vibration unless it is center mass balanced. Dampening reduces the effect of vibration fatigue. Does the piston act dually as a dampener?
@@amedmesa814 What you're really seeing here is an older wobble plate design. The real design used in clutchless compressor is the swashplate, where the pistons are mounted on the edges of the rotating plate by means of hemispherical bearings ("shoes").
This looks more like an Harrison V5 or Sanden SD-V wobble plate VDC than a clutchless swashplate VDC. I don't think wobble plate clutchless VDCs have ever been made, even though some wobble plate VDCs (Sanden SD6C12 1355F for example, and also an Harrison V5 on a Renault application) have been successfully equipped with the solenoid displacement control valve peculiar of clutchless ones.
Just finding about this kind of compressor today... I misdiagnosed an ac issue because I thought the clutch was spinning regardless of the switch being on... Now I know.
So you take a variable stroke tilt block mechanism that's been on hydraulics (think ship's ram steering) since the 1930's, and now it's a completely new thing to patent if you apply it to air conditioning in the 2000's. I guess it's all in how it's used, but some "lego-bricks" really aren't as new as they're made out to be.
i'm concerned about the wear that compressor would have... that thing is just keep spinning even we don't use it... in conventional compressor, the compressor just stopped and no wear
The chemistry of double end capped PAG 46 oil, and the cooling effect of the suction gas, is what keeps wear rate at a minimum on a perfectly kept AC system. The real problem comes when it's run on increasingly low refrigerant levels, making the oil circulation rate inside the system decrease and the wear rate increase. Run it with no refrigerant inside and drive the car as usual, and you'll immediately get a seized compressor.
Total disappointment ! Bought a 2014 Jeep Patriot for my daughter, a week later the compressor pulley bolt broke 😳 even buying ON LINE still over $400 to do the job WELL DONE , POS Denso variable displacement !! Never before I had an issue with “old fashioned” compressor 😡
badest designthis compressor designed t replace periodicaly ,not just compressor also the radiator and evaporator hould change if this dump compressor brake-down.until now i dont have any idea why this design use in many hight class vehicle,and its not logical the compressor circle all timewhen engine work????????????????in clutch system the compressor just work if the AC turned on but in this bad system the compressor circle round time to reduce the life cicle.the idea of variable desplacement just to bay more and more.i have this system in my car mercedes w203 chang the compressor twice then fail again , thats gude e to replace it by clutch compressor for model 1999 e clas cmpresor now it work from 4 years in grate condition without any fault.from month ago my LR3 2006 compressor destroiedi seel anew compressor fron ebay its work just for 1 monthnow im lookig for alternative clutch compresor.
The real problem with these compressors is that if the refrigerant runs out for whatever reason, they remain operational, unlike ones with the clutch, which get turned off since a pressure switch or sensor senses the low refrigerant pressure and prevents the compressor from engaging until proper pressure is restored. No refrigerant means that the lubricant can't flow around. Some oil may still remain inside the compressor's crankcase and keep things lubricated as long as the engine is kept into idle, but if the engine gets revved up then there's a chance it either gets pushed out into the HP pipe or carbonizes due to the intense frictional heat that develops (usually cooled off by the suction refrigerant), and you get a seized compressor as a result. That's the real reason behind their failures.
When there’s a leak, this type of compressor fails easily, because there’s no way to stop it from running while oil has leaked out! I would say, it’s a stupid design!
Thanks for the kind words. Hope to keep seeing you here...
I love the way you break down your explanation of all things auto-mechanical, however if you would just do a normal voice over it would make your videos sooo much better.
Holy cow! The audio explanation makes this simple device sound very complicated!
If you just look at the animated diagram, the operation becomes very clear.
It really exaggerates things
It's not that it's more expensive, it's that it is a newer technology. But you'd be amazed at how many cars are now using this latest AC development. Often times they don't even advertise it because folks don't know much about AC systems, so it'll just confuse the public, but it's there. Yesterday I saw a tiny KIA with GDI or gasoline direct injection (just finished the series for that) and I was shocked. So look close next time. It may have a VD compressor. Thanks
2012 kia optima clutchless compressor....cold air only when revving rpms up to 2500 rpm...low pressure side is high at idle and warm air out of vents....raise rpms and it lowers but is still high and air is cold out of vents...bad solenoid valve? Maybe sticking and not opening all the way? When rpms increase it spins more but displacement never gets biggers because solenoid valve is not letting it?
Go to my site and get the PWM Controller
I have this Sanden in my 2008 VW Rabbit Mk 5 and I love it! With over 157K miles on it, the system has been trouble-free. However, the OEM solenoid was not a good design and did not allow the compressor to cool fast enough or cool enough. I replaced it with an upgrade RKX AC Compressor Control Valve Solenoid which makes it work perfectly, faster and cooler.
I do have one question: What controls the coolant temperature, fan speed? If I want it to be less cool with the fan at low, I can only add warm air to it.
Great video!
Not possible at this time. Our intentions is to keep teaching people using whatever resources we can find. thanks for sharing.
Our pleasure... Keep posting and participating...
Although the compressor has a low internal failure rate due to continuous internal lubrication, the pulley bearings stil fail. Unfortunately most manufacturers don't sell the pulley bearing separately forcing people to buy the whole compressor. These compressors can be double what common clutched compressor cost.
Amalgamous Proxy Thanks for sharing. You might be able to get the bearing from the bearing manufacturer. There are not that many of these around, but it might take some research to find them.... www.autodiagnosticsandpublishing.com/auto_repair_equipment_catalog.html
Sakkibv
vatha
Trust me, let it run without refrigerant (what happens when the AC system has a leak and the owner just doesn't care about it and lets it run dry), rev it, and the compressor seizes. No refrigerant means no lubricant flow across the system and whatever is left inside the compressor either gets pushed out (remember, no VDC can ever reach absolute 0% displacement; if that were to happen, you'd need to tear it up to bring the pistons back into stroke) or carbonizes pretty soon due to the intense frictional heat. A clutch equipped VDC is much much more reliable than this stuff.
so glad my college class in 2023 is making me watch a video from 9 years ago
Cool, which school?
Questo procedmento si adottava gia' trenta anni orsono negli essiccatori dell'aria compressa. Quelli costruiti negli anni 60 ancora funzionano. Il problema e' solo quello che oggi non ce' piu' il tempo per formare professionalmente il personale, quindi speriamo che il concetto dia buoni risultati nel tempo.
Ok
2014 kia rio.
idling in a desert summer, above 100°F.
i have to pump the gas pedal to rev up the engine, to get colder air .
otherwise, the ac air at idle (in a triple digit ambient temp) is only cool but not cold enough to relieve.
never had such a problem with a 2004 pontiac that used a clutching ac compressor.
Ok
Would this be the same style thats in a clutchless Denso ac compressor? I just found out my 2010 Corolla has a clutchless compressor. I never heard of them before. Thanks.
Most folks don't know about it. And most techs don't either.
Variable ac compressor have any change while giving acceleration?
Yes
Just what I need a very good explanation
Thank you...
I have a question. In cars with variable displacement compressors, it is supposed that the compressor is operating as long as the car motor is rotating. So, what does exactly pressing the AC switch button do in this case?
100% duty cycle.
I can not find out by what the piston stroke increases. What causes the piston pusher to twist?
Don't know
How does the piston stroke increase due to the valve? I can not figure it out.
Ok
Saur sunstrand used the swash plate method in there bdp and bdu pumps in the late 80's and 90's.
Yes
Informative and well explained.
👍www.paypal.com/donate/?hosted_button_id=F9W5VPHTGWBV6
Hello sir can you send any video on cluch type variable compressor diagnosis.
Email us. Thanks, DONATE: www.paypal.com/donate/?hosted_button_id=F9W5VPHTGWBV6
CONTINUED FROM 1:
The end result is that at the expansion valve outlet, there's cold refrigerant but enough to cool a lower volume if passing air through the evaporator. This is that same as cycling the old style compressor clutch, but much more efficient. Pressures should remain at the standard or around 39 PSI low and about 250 PSI High. Fluctuation may change a bit of course, but that's the rule of thumb for r134 and even the older r12. Makes sense?
WOnderful, wonderful. Thanks again Mandy!
I do have a question - with this approach to an AC compressor - I wonder why more automobiles don't use this type of system? Even today - we still see the typical electromagnetic clutch on belt-driven compressors. It it more expensive for this option?
im guessing its more expensive.. sorry it took 9 years before a reply came!
My nissan tiida has a variable compressor with clutch only engage when ac on.
Ok, normal
All your videos have great information, thanks for sharing!
hi, i have the same system in my mercedes w203, the compressor dosent boost the gas, so i opened it and look inside, nothing special, it will be the electro valve faulty? what you suggest? thanks a lot :-)
Wow!!! Engine piston propulsion and flywheel rotation should be made and designed this way!! Im calling up Toyota right now!
Why didnt you show me this design earlier 9 yrs ago?
Ok
So this clutchless compressor that means that your car doesn't have safety pressure switch ????
its amazing sir thanks for every tutorial you teach everyone
Learning A/C at the moment so far pretty simple... But what is the best way to identify this type of system?
00:40 "When you turn on the A slash C..." LOL
Lol
Hi, what is the relation to crank case pressure to suction or discharge pressure. In non variable ac compressor, I understand suction and discharge. I am not able to relate to crank case pressure. What is this pressure and how is it related.
It would need a controller to be able to operate the displacement solenoid, but I think it's doable. thanks for sharing.
is that controller available at a dodge, chrysler dealer?
Very heplful video .every thing was clearly explain .Renault using Sandan make compressor.
can this be used on an Vintage air system?
I drive a 2021 Volvo semi with a compressor like this.
Great
Constantly moving internal parts need lube as mentioned in video but what happens if the refrigerant charge along with the oil is lost due to a leak?
Then you're doomed !
Even if there's no refrigerant at all some oil may remain inside the compressor's crankcase and keep things lubed up (albeit very noisily) until you forcefully rev the engine. If it gets revved up too much, the oil can get pushed away inside the discharge piping and leave things inside unlubed, or heat up too much due to the intense friction (with a proper refrigerant charge, the compressor's internals are cooled down by the cold suction gas; keep in mind that some friction is always there even if it's at minimum stroke because minimum stroke is NEVER 0 stroke) and degrade into something that no longer functions as a lubricant. That's when everything seizes up. These compressors don't have a sump and a dedicated oil pump unlike what you find inside, for example, a Valeo TM-31.
The pressure relation is the same. At lower strokes mode the compressor will just be pumping LESS refrigerant, due to lower demands of course. Keep in mind that even if the displacement is lower, AC compressors pump LIQUID, which can not be compressed. You can compress a gas, but the liquid VOLUME stays the same even though it's pressurized. At lower strokes, the compressor is still pumping liquid, but at lower volumes and lower stress on the engine. CONTINUED 1
Sharing is caring! : )
If the solenoid (valve regulated) supplies a voltage of 12 volts, how many (mm) moves the needle in it
Fantastic! Thanks heaps.
Oh sorry - I was a bi it off. I meant that, you said that it was developed in 1985 - yet I see 2000+ cars that still use an EM clutch (mine included). Mostly was wondering why it took 20 years to catch on.
Seems this was inspired by helicopter design. When these compressors fail the shaft shears and only the outer ring spins.
No, that's not what the video says. If you loose charge, the swashplate inclination goes to nothing or zero angles. The compressor keeps turning, but the piston stroke is none-existent. For all practical purposes, the only components turning are the pulley and shaft. These get lubricated anyway from the circulating oil and the oil inside the compressor. Makes sense?
Thanks for posting.
thanxs for todays class fellas...modus.
how much torque(HP) required to run compresser
satish rathod 2kW
Thanks for sharing.
Can you tell me the problem when i turn on the A/C the engine dies...
Ramil Fajardo See if the engine dies when you slightly accelerate the engine and turn the AC on. If it does or it makes noises then the AC comp is seized. More than likely it is the IAC or the ETC system.
Thanks
+Ramil Fajardo Clutch is seized.
Thanks Sir, Great observation channel
👍❤️🇺🇸
Thanks
I think this design will vibrate more due to an unbalanced mass rotating causing fatigue failure in the parts as well as efficiency loss. This is the trade-off for the benefits.
It can not vibrate or it'll disintegrate. Most cars are now using this type of compressor.
As far as I am aware rotating mechanical devices experience vibration unless it is center mass balanced. Dampening reduces the effect of vibration fatigue. Does the piston act dually as a dampener?
@@amedmesa814 What you're really seeing here is an older wobble plate design. The real design used in clutchless compressor is the swashplate, where the pistons are mounted on the edges of the rotating plate by means of hemispherical bearings ("shoes").
This looks more like an Harrison V5 or Sanden SD-V wobble plate VDC than a clutchless swashplate VDC. I don't think wobble plate clutchless VDCs have ever been made, even though some wobble plate VDCs (Sanden SD6C12 1355F for example, and also an Harrison V5 on a Renault application) have been successfully equipped with the solenoid displacement control valve peculiar of clutchless ones.
Not really
In my e87 BMW it starts and stops working randomly. Very annoying.
Just finding about this kind of compressor today... I misdiagnosed an ac issue because I thought the clutch was spinning regardless of the switch being on... Now I know.
👍❤️😃
Thank you for posting.
So you take a variable stroke tilt block mechanism that's been on hydraulics (think ship's ram steering) since the 1930's, and now it's a completely new thing to patent if you apply it to air conditioning in the 2000's. I guess it's all in how it's used, but some "lego-bricks" really aren't as new as they're made out to be.
which causes the piston plate Lean to a higher pressure.
i'm concerned about the wear that compressor would have... that thing is just keep spinning even we don't use it... in conventional compressor, the compressor just stopped and no wear
That's exactly their makers evil intention !
majority of automotive companies use compressors equiped with external electromagnetic clutch and control valve, but VW dont
The chemistry of double end capped PAG 46 oil, and the cooling effect of the suction gas, is what keeps wear rate at a minimum on a perfectly kept AC system. The real problem comes when it's run on increasingly low refrigerant levels, making the oil circulation rate inside the system decrease and the wear rate increase. Run it with no refrigerant inside and drive the car as usual, and you'll immediately get a seized compressor.
Very nice thanks
Can we get this translated in human ?
Sure
Very good ! Like !…
🍎❤️👍
hehhehheeh....."Maximum Stroke Mode"......heheeehhehehe
@ 2:32
liked to see a whole video in Portuguese
jose goncalves It is possible if you can send in the caption for it.
Would you find some one to speak English instead of electronic speech synthesizer for your next video.
It's buy now if you want people to buy something. If you were saying by now, then... by now. :D
They go bad sooner than older one
Yes
thanks
👍
My car has this type and its failing
Ok
this voice is robot.....same voice that in twitch chat donation reading.....
Total disappointment ! Bought a 2014 Jeep Patriot for my daughter, a week later the compressor pulley bolt broke 😳 even buying ON LINE still over $400 to do the job WELL DONE , POS Denso variable displacement !! Never before I had an issue with “old fashioned” compressor 😡
Ok
badest designthis compressor designed t replace periodicaly ,not just compressor also the radiator and evaporator hould change if this dump compressor brake-down.until now i dont have any idea why this design use in many hight class vehicle,and its not logical the compressor circle all timewhen engine work????????????????in clutch system the compressor just work if the AC turned on but in this bad system the compressor circle round time to reduce the life cicle.the idea of variable desplacement just to bay more and more.i have this system in my car mercedes w203 chang the compressor twice then fail again , thats gude e to replace it by clutch compressor for model 1999 e clas cmpresor now it work from 4 years in grate condition without any fault.from month ago my LR3 2006 compressor destroiedi seel anew compressor fron ebay its work just for 1 monthnow im lookig for alternative clutch compresor.
The real problem with these compressors is that if the refrigerant runs out for whatever reason, they remain operational, unlike ones with the clutch, which get turned off since a pressure switch or sensor senses the low refrigerant pressure and prevents the compressor from engaging until proper pressure is restored. No refrigerant means that the lubricant can't flow around. Some oil may still remain inside the compressor's crankcase and keep things lubricated as long as the engine is kept into idle, but if the engine gets revved up then there's a chance it either gets pushed out into the HP pipe or carbonizes due to the intense frictional heat that develops (usually cooled off by the suction refrigerant), and you get a seized compressor as a result. That's the real reason behind their failures.
But due to this compressor life is very short its not success
Ok
When there’s a leak, this type of compressor fails easily, because there’s no way to stop it from running while oil has leaked out!
I would say, it’s a stupid design!
Agreed
This style compressors are junk