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Posted on Dec 28, 2008
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Thermostat is not opening but if i put it in boiling water it opens. i replaced the water temperature switch today but it registers in the red zone and the thermostat does not open. even if it opens in boiling water does that it is good or can it still be bad.

  • super4dodge_ Dec 29, 2008

    I did that. Ok i replaced the thermostat and temp switch i ran it and it opened and i bled the air. Now, it wants to ride in the red zone but if i drive it it goes does alittle but then climbs back up. I bled the system for ever until there were no air bubbles. But, if i run without it it runs way below normal. Could the gauge switch be bad.

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Marvin

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  • Acura Master 85,242 Answers
  • Posted on Dec 28, 2008
Marvin
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Chances are u have something else going on like an air block in the cooling system, if u changed coolant and didn't follow the factory procedure for refilling this could happen, the other issue is a blown head gasket, which if u have overheated the engine very many times is most likely what u have going on. The way u checked the thermostat is ok, but it is best to use a thermometer and watch where it starts to open, that should be around 190 degree's F.

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Related Questions:

0helpful
2answers

How can you determine if your thremastst is gone bad

Remove the thermostat and place it in a some sort of container that you can use to boil water. heat the water and watch the temp (you will need a cooking thermometer to monitor the water temp.)
The thermostat should have a number stamped on it which is the temp it is supposed to open, most likely it will be 190, might be 180. watch the thermostat as the water temp approaches 180 and up.....you want to see when it opens. If it is bad it will probably open late (above 190) or the opening will be small and not allowing the water to flow as it should.
The simplest solution is just to buy a new thermostat and gasket. They should cost about $15
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you might have an air lock in the water system.
start the car leave the cap off put you bower on hot and leave for 10-15 mins if should get the air lock out
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Antifreeze boiling over when car is overheatind and Wen its not overheating changed thermostat radiator bled and flushed it changed temperature switch no oil and water mixture No smoke

Check the over flow tank located in front of the passenger side glove box for water or fluid. When driving the car, listen by the glove box to see if you car hear a boiling sound. If you can hear water boiling or moving, check your heater core to make sure it is not plugged or bad. When the car starts to over heat, does the gauge register that it is getting hot? If it doesn't then check the thermostat to make sure it is not stuck open or closed. If its over heating and the gauge is not showing that the car is running hot before boiling over, then the thermostat is defective or not working. Try replacing it again.
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Over heating! How can I tell if I need a therostat?

Remove the thermostat from the engine. Look on the thermostat and there should be a temperature stamped on it. Go to the kitchen and put thermostat in a pan with water make sure the thermostat is covered with water. Turn the stove on and watch the thermostat opening before the operating temperature stamped. on the thermostat. Most cars have a 195 degree thermostat. If it opens before the water boils, it should be alright. If not change the thermostat.
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My engine light is on, and my car is overheating,how can i check if the problem is the thermostat ?

take the thermostat out, put it in a pot with water and heat the water, if it starts to open long before the water boils then the thermostat could be considered ok as long as it opens within the specified heat range.
To check the temp that it opens at you can put a cooking temperature gauge in the water to check the opening temp
hope this helps
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Antifreeze ts boiling back into reservoir. Possibly not circulating properly. Thermostat problem? Temperature fluctuates with changing load on engine. Approaches the overheating "red zone" with an extended...

it sounds like a possible head gasket problem,you can get the fluctuation from combustion gases getting pumped into your cooling system and creating gas pockets,i would suggest taking it to a shop and have them do a block test to look for combustion in the cooling system to confirm the problem,that way you will know for sure,if it comes up negative they can also perform a flow test to make sure there is no restriction in the cooling system such as a plugged radiator or a bad thermostat,hope this sheds a little light on it
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This an engine coolant temperature fault, most likely caused by a defective thermostat, probably one that is open all the time.
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What should be the thermostat temperature for a car in Edmonton, Canada, Where the temperature varies from +30 to -35?

Your thermostat should not remain closed if the water temperature is above 85. The best way to find out if the thermostat needs replacing is to remove it (when the engine is cool), place it in a pot of water with a candy thermometer, and boil the water. You will see the thermostat open at some point. If it opens before 80-85, replace the thermostat.
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Thermostat

It should open when it gets up to the opening temperature. Better way to test it is to put the water in the pot, hot from the tap, and put it on the stove. Put a thermometer in there too so you can monitor the temp. Drop in the thermostat, then heat the water on the stove. When it opens, note the temperature that the opening occurs at - then you can see if it's opening at the correct temperature. If you put it in boiling water, it'll open - but you won't know if it opened at the right temp.
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