How to Tell Car Thermostat Is Bad (Symptoms of Stuck Open Stuck Closed and Overheating) 

Basically he said basically about 100 times

This guy is basically the best for vehicle problem solving.

This is the first time i hear about the link between the remp. Fluctuations and thermostat stuck partially. I have been looking for this in many videos but i only found this information in here. Thank for much. 😊

This is a very informative video within a short time. Thank you for sharing

Thanks. You explained this well.

Great channel man 👍👍

Great video, thank you very much!

Very interesting and helpful information.

Thank you. You helped me figure out my issue. My thermostat in my vehicle is stuck open.

Thank you. Hopefully this is the fix.

Great information

So Basilly.. You are the best

Keep it up brother

Thank you my friend

I remember you from welcome back carter....we tease him a lot cus we gottum on the spot welcome back

Basically

Good video thankyou I subbed.👍

Perfect explanation

Basically, this was very helpful! Thank you.

Good info 👍

Very good video. I'm subing

Thanks sir

My 2019 Altima was running cool and my heater wouldn’t blow warm/hot air, with check engine light. But, my mechanic didn’t diagnose it. Now the temp is fluctuating, and it’s having a rough start with smoke, sometimes dies and have to restart. It still runs smooth, once it warms. Just wondering if this is most likely the thermostat, and if the rough start could be from too much coolant? Also, is the thermostat change out the same in the 2019, as it is in a 2018? I can’t seem to find a video for a 2019/2020.

Basically good information… 😅

"Basially"..."Basially"..."Basially"...good info basially

Brand new thermostat installed!!.... Engine is at normal operating temperature but lower radiator hose still cooler than the upper radiator neck to engine coolant hose.... New radiator, upper and lower hoses and clamps too! Bled the system of air and still have the issue of that lower hose being cooler even at normal operating temperature!

Excellent video

Also, if you have no cabin heat and your engine is overheating it is a sign of a thermostat stuck closed.

Will a 180 thermostat for my 7.4 454 Chevy good or go higher?

When the thermostat stays half open it is called a lazy thermostat. You can test the thermostat showing it opening but Doesn’t still mean it’s not lazy

Partially open section is what most people doesnt mention ,my thermostat was like a new but it was partially open and close cant fully open itself ,ı think is if its clean or rusted no mattar what change it every 5 years or 7 years max.

I have a 2010 b6 passat tdi, today while driving i realised my coolant temp fluctuating between 70⁰c and 90⁰c and when i opened the bonnet i saw what appears to be a leak from a hose connected to the radiator. Does this mean i have an open thermostat?

Thanks for sharing this video Is it Wright when thermostat stuck open means increasing fuel consumption ?

So my ? Is I have an O2 Toyota Sequoia and today as I was driving my check engine light came on and Auto zone said it was my engine coolant temperature but my heat works good and wasn't going hot and I. Can also squeeze my radiator hoses .also I have 281k on my vehicle and in. The pass my check engine light will come on but go away over a week or few days so kinda wondering what it could be

I have a 1993 Chevy S10 pickup and I have no heat in it I clean the heater core would that be the thermostat then

Basically nice video

back in the summer my toyota corolla 2005 temperature gauge would go up and down after engine warming up and now in winter the gauge wont go to middle and heater take like 30 minutes to barely blow any warm air and for hot air it takes like an hour .tnx bro i will change the thermostat

I have a stupid question. Just did head gaskets on a 2010 dodge Dakota 4.7L. Got it all back together, topped off coolant after letting it run to bleed air from the system, and it’s been overheating ever since. We replaced the water pump gasket, the water pump spins fine with no vibration or chatter so the pulley bearing and fins are good. Replaced the thermostat and housing gasket. Vacuum tested the system and it held at 26inhg for over 5 minutes. Still overheats. Found out about the infamous 3.7/4.7L bleeder plug on the top of the timing cover where the upper radiator hose attaches. Had zero bubbles come out until the truck almost hit the halfway mark on the temp gauge so I’m not sure if they were air bubbles stuck in the system or just bubbles from the coolant starting to boil over. Heat works, engine runs fine, no misfiring or sputtering like it’s struggling to stay running due to overheating. No check engine light, no leaks, no smoke. Upper rad hose gets hot but lower hose is cool to touch even after needle crosses the halfway mark. So do you think I have a faulty thermostat (a Stant advance auto parts model) or am I missing something here? Oh yeah and it has a new Radiator and cap as well.

My rsx recently got mildy hot but i turned the heaters on and they werent getting much heat at all so i turned the car off for 25 seconds and it went back to Operating Temp but the heaters rlly only got hot when i would actually drive

My 2017 Colorado temp fluctuates and is leaking when I park it

Thanks. Do you happen to know if it's okay to use coolant flush to clean the system after replacing the thermostat? I'm planning to replace the thermostat and the radiator hoses then flushing the cooling system before I put in new coolant.

have a problenm thermonstat is broken no center no spring trying to figure out wat r where did center go i just tok off all i have is round piece withe hump over the back but the hole center and spring is missing

Hi. My NOTE 1.4 PETROL has an issue that everything is ok for the cooling if the temp is up to 95C. If it goes over, due to higher RPM, the temperature start rising and the temperature only goes up. No coolant leak, no bubbles in coolant on idle, no oil in coolant. No codes on OBD. Any idea what could it be? Thanx for any help.

Hey my 520d F10 sits under the centre of temper gauge just little bit to the left is this normal?

Will it create noises around the thermostat housing

I got a 2000 toyota camry and i have the common sign which is the temp fluctuations like you said , the temp gauge goes high and low while driving . So i guess the thermostat got stuck open cause my car doesn’t heat properly and in winter time , when it’s very cold , the heat doesn’t work properly so i’m cold sometimes on my car. So do i need to change the thermostat?

What happens when it only over heats when idle or if it's very very hot outside

I’ve replaced the thermostat and it turned the check engine light of but the car is still stuck on cold my heater works fine and everything I understand it’s probably stuck open but not sure how to fix the problem

Mine had a weird behavior, it was never reaching normal temperature (it was in cold) and the engine was warm, then I park and when the gear was moved to P, suddenly changed to normal temp, also when I changed from AC to heating knob, it changed to normal temp again

Can I still drive with a P0128 code. My engine fan keeps running

Hi can someone please help. I have a Peugeot 307 petrol and the temperature gauge for Both oil and coolant works and goes to the middle while sitting in idle, but soon as I drive the temperature on both gauges goes to zero and no heat in the car. If I park in idle the gauge and heat works normal.

Lately the temperatures have been rising in Southern California, I have a Chevy express with the 6.0 and today while driving through the mountains I stopped for a bit on the side of the road and the temperature read 210 it used to read about 180 few weeks ago and it is usually at 190 more or less. Should I be concerned?

I have problem my golf 4 tdi gauge goes normal at midle 90 but i See engine is overheats And Fans not comes on i change sensor still dont comes on Only some times idk

My fans won't come on when they need to. Occasionally I will get just the A/C fan but at a lower speed and the regular fan kicks on for a second then turns off. Same after ecu reset. If I jump the sensor/switch on the thermostat housing BOTH fans come on very strong. I noticed my iacv is leaking from the middle gasket also. When I leave the cap off and start the car, the coolant eventually starts to boil and thats when I notice reservoir going low. Any ideas what this can be? I purchased an OE thermostat a month ago, along with all fan switches. Relays are good.

My temperature gauge has been rising only while in park after driving for a little. It goes up to between 1/2 to 3/4 but when I drive again it goes back to normal. I just had a heater core replaced for leaking coolant from behind the glovebox and it was smelling from the vents. That has been fixed but now I’m having temperature problems while in park. I wonder if maybe something wasn’t put back properly or if I have a bigger problem now?

Quick question if you don't mind. Will overflow tank bubble and coolant drain if it's the thermostat?

I have a 2000 Isuzu Rodeo that overheats. It melted the radiator cap, so I replaced that, but its still overheating. NO heat when turning on the interior heating floor/vents or defrost. Has a new radiator and no coolant leaks. Thanks

Would the heater core also blow cold if the thermostat is stuck closed?

No garage has been able to work this one out! VWTouran 62, after both thermostats were replaced by dealership (because of overheating issues )afterwards I now have underheating issues! The dash temp guage sensor has been replaced. Still the guage fluctuates up to 90c n back down to zero. Oil is 50 to 60. And not much heat in cabin. Tho it can stay at 90 and oil at 100 and good heat in cabin. Each time I drive the car I do not know what to expect because its intermittent. Water pump has been changed. AA guy came out today as engine light showed. He was certain it is the thermostat but VW wont except it! I have no idea what to do next.

My cars normal temp is 210 Recently its been 180-185 then it goes back to normal themp then drops. Seems faulty ima change it. Cars been driving weird too

So I have a question, my heat will not work on the 3 lower settings but will blow on the highest for 3-5 minutes then kick off. I’ve replaced my blower motor resistor and my blower motor fan works, what could it be? Must I add my car isn’t overheating at all, and it gets up to operating temps just fine

I have a 20-40-thousand-mile Subaru 6-cylinder engine that sat on a bench in an unheated or cooled garage in the Northeast for a few years with no antifreeze in it. When I ran the engine, the thermostat never opened. Could it have rusted shut or something else go wrong when it wasn't lubricated? Thanks.

I have a 2006 Chevy Impala. Hot Engine symbol on cold startup, as the car warms up it goes off. Is this my temp. sensor or the thermostat?

My thermostat is stuck open on a 2004 Kia Pregio Diesel with no EGR or dpf. I can't afford to fix it until next week. My question is will it damage my engine if I drive for 30 minutes a day at 60 kilometers per hour until I can afford to fix it?

May have to change mine by looks of it. Was originally told my hearer core had blocked up so i changed that but im still not getting any warm air inside the car. Pipes to the heater core are warm, the hearer core itself is hot but still no hot air been blown into car. It blows cold and slightly gets warm when driving but nothing more. You think its the thermostat thats the issue ?

So my temp gage goes from super hot to regular tempatures and keeps moving .. that means it’s partially open? && does it effect the heater in the car ?

I just bought a 02 acura mdx and it runs at normal temp but blows cold air could this be a bad thermostat

Can this be the reason why the heater in the car doesn’t work anymore as well ?

Basically, wow

Show my car overheats when coming to a stop but cools off. Once I start moving I can hear the fan kicking on and off every once in a while.

I recently bought VW mK7 2.0 TDI and I noticed one thing. The car reaches around 90 temperature in 2 3 minutes. Is that normal? And even if the temperature is like 80, when I turn off the car, the car start cooling on their own. The temperature never going over 90 but idk if it's normal thing or? Anyone with similar problems?

So my rover took longer to heat up than normal and when I drove it it spiked up to H so what are the symptoms of that also it was blowing cold air

I have a 205 gmc sierra and I replaced the thermostat because the temps where up and down and heater wouldn’t heat, now heater works fine but I’m guessing the thermostat is stuck open because it won’t get to opperating temps and I got the p0128 code… I’m not sure what else to do because both thermostats worked when I tested them

Hey so my car overheats after sitting idle for awhile but on freeway it under temp and cooler by a bit and it takes a bit for my car to hit 180 on my gauge will a stuck open thermostat cause that? I changed everything my radiator my fan my thermostat my water pump and I’m still getting hot idling like if I did virtually nothing.

My 2018 JKU is operating fine but I have the P0128 code on my dash

I have to replace my thermostat about every 6- 12 weeks, because it stops functioning properly. I have used after market, I have used Genuine parts, doesn't matter how cheap or expensive. When seeming to function correctly it runs between about 160° to 190° and heater and AC work perfectly fine. But when the thermostat isn't functioning, my heater still heats like normally, but the AC does not cool at all. Anyone have any ideas what is going on?

If the thermostat is stuck open, is it possible that the transmission will overheat due to the fact that the cooling fan will not going to turn on due to that the coolant sensor will not trigger the ECM to turn on the fan? Is the transmission oil cooler cools itself because of the radiator fan?

I have a question, and it would be very helpful if you had time to answer. My volvos temperature is not reaching the correct temperature when idling, but while driving the the temperature is in order. As soon as i stand still while the car is running- the temp is dropping. What could this be? Thanks

If I'm losing antifreeze and when defrost is open it doesn't overheat but if normal heat on it does overheat. Is that a thermostat

👌🌷

So basically I have to change my thermostat. ❤

Y when I turn my ac on the temp goes up

If my thermostat is stuck open should I replace the thermostat?

What if I changed my thermostat but the thermostat went bad again ?

hello, what if my temp is not reacing operating temperature if i use the car heater?

My 2007 BMW X3 has a stuck open thermostat, oi, after two big repairs already!

Mine go up and down pretty much

What could it be if radiator fan does not come and car does NOT overheat?...Btw,fuses,relays,and fan are good.

@everyone I recently changed my thermostat and coolant temp sensor both as original parts but still my corolla 2013 has temp gauge not getting to middle and even getting low reading mean over cooling…. Can anyone tell me reason pls

My fire fusion’s driving me crazy man 2o14 2.5 liter there’s a leak near the plastic 3 way value that he upper radiator hose connect to next to the reservoir it leaks when I drive but there’s not crack. I changed the hoses the clamps it still does it I can’t find that part any where Only other thing I think it couid be is the thermostat anyone have any knowledge on this I’ve never had this happen I’m so irritated

I have a 2007 Pontiac G 5 2.2L with the heater: • shutting off when I drive over a sealed line on highway, or accidentally drive over a pothole. I generally avoid driving on potholes; • turns back on after driving over sealant line on highway, or a pothole; • heater does not turn on when it is really cold out; and • driver side footwell gets hot in the summer, especially the floor. I changed the blower motor, blower motor resistor, blower motor switch, blower motor relay fuse. My thought has always been that the thermostat needs to be replaced. I was told the Climate Control Module needs to be replaced as the Recirculate button flashes a couple of times and does not stay on. That one costs like $880 at Napa! I would like to know if failing thermostat causes my problems? Or is it the Climate Control Module? Thank you.

The hose from the radiator to thermostat is never get hot so I change the thermostat and still the same I drove the car like this more than 2 years and it’s never got overheating ..help plz what’s wrong

What if an older 195° thermostat is only 1/8 inch open all the time and the engine temp stays below 200, even lower in the colder months? But soon after installing a brand new 195° deg thermostat the engine goes into near overheating, before dropping down to under or at 200°???

You have a teenage daughter, I know the signs, lol.

I just replaced my thermostat, few weeks everything was fine. Now all the sudden it’s bouncing to hot to middle

If am filling coolant in the reservoir very other day? Would that be a sign of water pump going out? Please help

The offensive was helpful but he never showed what each fault looks like meaning what does a stuck thermostat look like or open. I still don't know

Basically. 18 times. 😃

So basically

So basically you're saying replace that damn thermostat! Basically 😝