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Does your Coolant Thermostat work? Quick simple test without removing it
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- เผยแพร่เมื่อ 15 ม.ค. 2019
- Simple testing the coolant thermostat is working properly without removing it - on any car
See pinned comment for coolant temperatures, thermostat opening, radiator fan
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Coolant temperatures:
The gasoline engines from around 2000-2010 work at 90C idle up to about 100C in normal driving, up to 115C under hard acceleration or in slow traffic hot summer day. Thermostat starts to open at 90C and is fully open at 95C. Radiator fan starts spinning at 115C. Note that fan usually will also spin if A/C is on.
On a cold engine start, the gauge reaches the middle position after the coolant has reached about 80C. The gauge stays in the middle without moving for a coolant temp range from about 80C to 120C. Actually, on many cars the gauge will always sit slightly to the left of the middle - this is perfectly normal.
Coolant temperature sensor failure: usually the needle will jump at hot (red) at cold engine start, or will climb with 'jumps' as the engine warms up. Always inspect wires/connector at the sensor.
Cars made after 2010 have different thermostat temperatures, often times the thermostat is also electrically activated.
On cars made from 2000-2010 when starting the car with cold engine, the hose gets hot near the radiator only after the thermostat opens - 5-10 minutes after the temperature gauge arrives in the middle.
On cars made after 2010 the hose at the radiator may get warm shortly after cold car start, well before the thermostat starts to open (different system, thermostat opens also electrically at different coolant temperatures). Example of Electronically Assisted Thermostats th-cam.com/video/BZHwu36hp-c/w-d-xo.html
what is the normal operating temperature for this engine?
@@SamChibale-tj5yt the gasoline engines from around 2000-2010 run at 90C idle to about 100C normal driving, up to 115C had acceleration or slow traffic hot summer day. Thermostat starts to open at 90C, fully open at 95C. Radiator fan starts spinning at 115C. Cars made after 2010 have different thermostat temperatures, often times the thermostat is also electrically activated
Very well spoken
thats a good idea. Save you all the work. Thanks
Thanks 👍 great video
Good explanation
I had this problem, and checked the car with OBD adapter. Indeed, the engine wasn´t ever reaching 65C. With the new thermostat it´s at 85C.
At what mileage does this happen to your old thermostat? Mine is about 85K kilometer odometer. Nothing yet happens but thought of replacing it?
Thanks for this vid brother smog guy told me to change the thermostat bit I wasn't sure until I saw your vid thanks very much
Welcome
Thank you this was very clear.
Welcome
Thank you
Hello, I suffer from a lack of water in the car, and there is no leaking hoses or radiators, does the thermostat do that in case it is damaged, as I notice a sudden drop in the temperature of the car and it did not rise from its normal position to 80C
when Stuck Open Thermostat is to cause to lack of water , the weather is summer ??
my gauge shows operating temp in the middle (normal) i noticed awhile back it never reaches the middle line and always below it and neverrrrrrrrr reaches it , is that stuck open?
Thanks for explaining.
thanks!
what if the gauge is on the middle and vadis shows 105C and fan is not starting shows ets with this temp has 250 ohms . My Gauge never went to red zone and build up pressure kills my radiator. and i dont have blown head gasket
Hi Tomasz, does that fan start spinning as the temperature goes higher than 105C ? It should start spinning around this temp (plus minus). There are also a few things too look at. First, remove the coolant reservoir cap, at look at the green gasket. This gasket can go bad after many years and leak pressure. The reservoir should keep a certain pressure inside. May try replacing or flipping the gasket on the other side. Also look at the small return hose at the top of the reservoir, it has a clamp on it, make sure it's tight (may crush it a little with the pliers to be sure). And easy way to test the radiator fan, is turn on the A/C in warm summer days: the fan should start spinning at low speed (it has two speeds). I recommend also replacing the thermostat after 10-12 years, and flushing the system with Prestone like here th-cam.com/video/69ymGTqHxRw/w-d-xo.html And keep in touch on forums such as www.matthewsvolvosite.com/forums/viewforum.php?f=9
You can read the digital coolant temperature using a cheap diagnostic tool through OBD2 port
Where does it measure the temperature -- before or after the thermostat?
@@wellnesspathforme6236 after becouse there is the sensor
thermostat or termostat housing?
Im having problem after when i drive two kilometer when i turn off the engine i couldn't restart i have to wait for along time to cool the engine. So this could be a badthermostat? Please tell me how to solve it.
Best thing is to ask on a forum for your car model
nice video thank you for sharing. i have a 04 s60r and the engine is running a litle on hot side mor then 90c.
I understand it`s for goverment regulation idont have a cat i have a snabb catless dp.It`s not good on the engine to run hot and lean on parts and piston ring and automatic transmission. After watching your video i was thinking of compairing my race car 06 300c srt8 hemi v8 6,1L and a little 3,0L twin screw supercharger I`m runing a 160f and it maintaine 170f it`s preventing heat soake, transmission problem, and i can add 2 psi1-2 deg of ign timing it all depend on dry air and themp .Now i like to tray the same on my s60R to prevent heat soak a 80 c t-stat if it existe or i will make it, and lower the fan themp by 10 c the transmission will last longer i need to find a tuner to make my s60r runing at 14,5t1 and 11,t1on tap do you know someone yhay can custom tune my car and when i get fmic should i go for snabb or do 88 any input will be greatly appreciated thank you.
I don't think it's a good idea to run a cooler thermostat especially on an engine that's going to be raced. The stat on these Volvo starts opening at 90C and it's fully open at around 95C. The radiator fan will kick in only after 105C, so the engine should have no problems dealing with coolant temps around 100c even when it's being raced, as long as it has the proper coolant and the spark plugs are in good condition. These engines have very strong head gaskets, it's very rare for a hg to fail, only when the coolant has been neglected for very long time, or when someone used tap water (of flushed with tap water) which will cause limestone deposits and reduce the engine cooling. The problem with modified S60R is the liner cracking usually from higher boost. The 2.3 T5 was actually a stronger engine that could safely take significantly more boost than stock
my termostat was stuck open 3mm and when i go drive downhill it would go from hot in middle cool down all way
same on me today ..what the problem?
hi there. Is this normal?
engine is cold. I remove radiator cap. Turn on engine. When engine reaches operating temperature, the coolant in the radiator starts to boil, not slowly and gently bubble, but boil aggressively.
what does it mean? Is it normal?
Maybe a failed hg head gasket. Try asking on the forum for your car. You may also get a hg test from Amazon www.amazon.com/OEMTOOLS-27145-Combustion-Leak-Detector/dp/B004FELK6A/ref=sr_1_4?dchild=1&keywords=combustion+leak+tester&qid=1604228220&sr=8-4
@@Peppermint1 thanks friend
@@Peppermint1 would a thermostat stuck in the closed position also cause the aggressive bubbling? Thanks!
I need to drive longer to get normal temperature but the tempereture is going up 90+? This can be termostat?
Yes but it also depends on the oil grade and on how hard (or gentle) you accelerate.
The test with the hose from the thermostat will give you the correct answer
@@Peppermint1 aham okay, and the water overheats and leaks
when temperature is going 90+..
Hey im having a problem that at idle it doesn't overheat but when the car running it will slowly start to overheat any help?
Let us know the car, engine and year. Your water pump may be failing or the belt has broken. Also make sure the coolant tank is at max when cold and try burping the air from the coolant
how do i replace thermostat after this test on volvo
th-cam.com/video/6daL0qzlj6k/w-d-xo.html
Hey,great videos so far, amazing DIY jobs! 👏
But why you drive your engine without the plastic covers on top?
Because of the heat for the coils and installation, or some other reason?
Thha5
That's right, as they get old it helps keeping the coils less hot. Another problem is the plastic of the wires to the coils gets brittle from heat. Also the top cover may accidentally catch and crush one of these wires. Speaking about coils, it is important to inspect the spark plugs for wear - when they wear they overcharge and damage the coils, and have a spare coil in your trunk because often times one will fail all of a sudden - no need to replace all of them, usually only 1 or 2 will fail th-cam.com/video/fnYUQh23p7Q/w-d-xo.html
Thanks got a 2000 cross country an i am having some of the problems your explaining.
Hey i have 2005 s60 2.5t i removed thermostat because i was replacing pcv so i took it off the way i put thermostat back and its not working correctly what did i do wrong did i break it? Can thermostat break if it was left dry for 2weeks?
You mean, the temperature needle doesn't climb normally when warming up ? Thermostat can stay dry for years without problems. First thing look closely at the cable to the temperature sensor connector at the thermostat housing. These cables crack near the connector. Then maybe see this video see if you put it correctly in place, with the pin into the cover and the air burping pin at the top th-cam.com/video/6daL0qzlj6k/w-d-xo.html
@@Peppermint1 i think it was because i spilled some coolant in sensors connector, and do you know where obd reader checks your motor temperature cause?
@@tase9441 Maybe ask on a Volvo forum like this one www.matthewsvolvosite.com/forums/viewforum.php?f=9&sid=52a9d0d6ddd94d3e1417fd336f44bfdf
After the car is up to running temperature, should that hose be warm/hot?
The hose gets hot near the radiator after the thermostat opens - this happens a few minutes after the temperature gauge arrives in the middle. The gauge reaches the middle position after the coolant has reached about 80C, while the thermostat opens at around 90C. Note that the gauge stays in the middle without moving for a coolant temp range from about 80C to 120C. The radiator fan should kick at high speed when the coolant reaches about 115C.
@@Peppermint1 My hose also swells and becomes hot id that normal?
@@user-nw7kf6nl2y When the engine is cold, squeeze the hose by hand, if the hose rubber feels too soft, it's time to replace the hose (before it will blow and leave you stranded). Otherwise, the radiator may be clogged
My temp gauge wont move I have replaced the temp sensor I left the car idling for bout 20-30 mins and nothing even the rad fan didn't kick in could this be the thermostat ?
Well if the coolant hose coming from the thermostat is warm/hot and the gauge doesn't move, most probably broken wire right where it enters in the coolant temp sensor connector. Or a disconnected wire at the gauge itself behind the instrument panel by a previous owner
@@Peppermint1 it did work before could it be a case of the thermostat stuck open?
YES. I had a temp gauge that wouldn't move from "cold", but my fans were
on "high speed". Replaced the temp sensor, didn't fix the problem. Replaced
the thermostat, cleared a P0128 trouble code, drove the car a couple of
miles, temp gauge worked normally, fans shut "off" completely. Before I
replaced the thermostat, I had heat in the car, but not as hot as normal.
@@Peppermint1 engine overheating. After running for a few minutes. Replaced thermostat. Top radiator hose hot(warm) but bottom hose cold. Any advice? Thanks.
@@raulzamora8928 The bottom hose gets warm only when the engine reaches about 90c and the thermostat opens. Check the any air in the coolant is properly burped. First, make sure the coolant tank is clean at the bottom (no dark engine oil mixed) and the reservoir cap seal is in good condition. Check the temp needle climbs from cold smoothly and steadily (no jumps). Wait until top hose gets too hot to touch. If still overheats possibly : clogged radiator or even water pump about to seize - if trying to replace the pump, make sure you test it by hand upon removing the timing belt, if the pump spins easily it should still be good.
hello what are the chances of this getting "stuck" closed?..................im actually more worried about this happening............thanks
That is critical indeed. I think it depends on the car. Some cars have different tstat design that can indeed fail and block the coolant passage. In particular the 3.2 XC90 has a special design with plastic tabs. May also have water pump failure, I believe on some BMW these had plastic impellers prone to early breaking
affect trans ???
Hey Peppermint!
My coolant temp rises very very slowly, but the cabin heating works after like 200 meters driven. (to reach “12 o clock temp” it takes like 20 km of driving (1500-2500 rpm, 2.4 gasoline))
Haven’t checked on the tube you shown yet, but can this be the thermostat?
It's normal to start having some cabin heat quickly, as the coolant starts warming up. But if the needle reaches 12 o'clock only after around 30 minutes driving in warm weather, that is too slow. Even at only 2500 rpm, the needle should be close to vertical after no more than 10 min driving in summer weather. It also matters the engine oil grade: a 10W-30 oil will take longer to warm up compared to a 0W-30 oil
Peppermint
Woah, that was a very fast answer!
Well, I have 5w30 oil, but this stuff just started happening like a month ago (even last winter it was fine, it took like 10-15 mins of normal driving, like you said, to warm up the coolant).
Gonna check that tube soon.
(I do those kind of easier repairs for myself (mostly thanks to your videos!))
Keep up the good work man, cheers!
@@zsszeli I have same or similar issue. Not even reaching needle middle up. Only when idling on parking
Wouldn’t that mean the thermostat could be stuck closed?
Sometimes it’s stuck open.
The hose going from radiator to thermostat is not getting warm enough in my car and the car uses long time to heat. I can drive 20 minutes and still not warm enough in cabin.
You think it is the thermostat?
My dodge truck was doing the same thing, more than likely its your thermostat stuck open...
@@tonyjordan1320 I changed it, but did not help. Sending the car to a shop next week to find ou
Yes
I have 3 cylinder car engine. But it takes 4-5 min to reach normal operating temperature or 800 rpm. Is it normal? Thanks!
It depends on the weather temperature and how is the car driven - if driven very gently inside city it can take 5-10 minutes to fully warm up.
@@Peppermint1 you mean when the rad fan starts to work or to reach normal idle rpm? Thanks!
@@arthurstone8664 The fans will depend on other factors. The best way to determine if the engine has reached normal operating temperature is to look at the temp gauge needle. When the needle is close to 12 o'clock position, we can consider the engine is warm (note that on many cars the needle actually never reaches the 12 position, but will rather stay at about 11h50 which is by design and perfectly normal). In fact, the 12 o'clock position represents a range of temperature - usually from 80C to about 120C. Engines usually stay between 90C-105C. Fans normally will spin if the coolant temperature reaches about 115C. Fans will also spin when the AC is engaged.
@@Peppermint1 thank you for that information. However, my car doesn't have temp gauge in may dashboard. So I'm basing on the rpm. It takes 3:20 min to reach 1k rpm from cold start. Is it normal, Sir? Thankss
@@arthurstone8664 Are you letting it idle from cold start and the rpm drops to 1000 after 5 minutes of idling ? Gasoline engine? What is the weather temperature ?