Question about 1991 Dodge Colt

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Thermostat How How do you know if the thermostat is not working

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It will be running too cool or will be overheating quickly. Test it by starting the car and after say 10 minutes at idle you should feel the top radiator hose get hot as the unit opens Check for water flow at idle when cold by removing the radiator cap ( in top of radiator) and seeing the water flow past at some rpm's.. Otherwise remove the thermostat and test with a thermometer in boiling water flowing the procedure in the workshop manual.

Posted on Apr 12, 2014

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The engine will heat up quickly, and the radiator will stay cool if its stuck closed, if its stuck open engine will warm up slowly and not reach operation temp

Posted on Apr 12, 2014


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Thermostat is probably bad.

Without knowing what year your car is, the thermostat could be here:


.To test the thermostat, put it in a pot of boiling water. If it clicks, it works. If not, then replace it.

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Could be some overheating problem there; on 4.5L and 4.9L engines, check this procedure:
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Engine Diagram 2007 kia sportage

With conventional cooling system, the upper radiator hose goes to thermostat housing on the engine. You drain antifreeze down, a little, remove radiator hose from thermostat housing, remove thermostat housing, the thermostat should be inside the housing.
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I am installing the thermostat on my F150 but it leaks, I done twice already,I know I'm doing something wrong,Is it the gasket before the thermostat or the other way around?

I'm having the same issue. I had to replace my front cover and I forgot to put in the thermostat. (Wasn't leaking at all). So then I decided to put it back in so I took off the housing and replaced the gasket and put in the thermostat. Now it leaks like no other. I have taken it off several times looking at it and I can't seem to figure it out. I have tried thermostat then gasket and other way around. I tried putting the spring part on the thermostat towards me and then away. Nothing is working. If you have figured it out let me know.

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2 Answers

How am i to know when the thermostat opens

The best way to know if the thermostat opens is by removing your radiator cap. Rev the engine and if you see the coolant moving on the radiator then that means the thermostat is open. if not then it is in close mode. If you want to open the thermostat simultaneuously, wait till your engine reach the operating temp. and turn the accleration wire in our engine. If you noticed the coolant is moving from left to right then your cooling systems is working and your thermostat is open,

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1 Answer

I have a 2000 Chevrolet Lumina 3.1 litre engine. The heater isn't working properly, it blows cold air for awhile raising the engine temperature. Once the thermostat kicks in the temp lowers which is...

Why it called DexKILL
Your best bet take it to a qualified repair shop !
Once the thermostat kicks in the temp lowers which is great. I know we have to replace the thermostat The thermostat doesn't kick in , it opens !!!! And if the temp. goes down when the thermostat opens ,it's working ! The redish clay looking stuff is rust , air got into the system . You probably have a bad radiator cap . Now you need a compleat cooling system flush !
Your heater core is plugged .

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1 Answer

Heater isn't heating very much. don't know if it is the thermostat, don't know where it is you know?

You might want to check your antifreeze if it's low it will blow cold air.
And maybe you should replace your thermostat as well.
Both of these solutions should make it work better.
Good Luck!

Feb 06, 2010 | 2002 Ford Expedition

1 Answer

Engine light has come on and the thermosat is not working properly

The engine light is probably on just because of the thermostat. Try with a thermostat you know is in order. If it works, change the thermostat.

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Dec 18, 2008 | 1994 Subaru SVX

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