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Antifreeze and Engine Coolant
Thermostats

Coolant is boiling in your reservoir but car temperature is remaining normal what is wrong?


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Wiki User
2015-07-15 20:48:32
2015-07-15 20:48:32

Sometimes it is not actually "boiling", but bubbling. Start by getting a new radiator cap. It is the first thing you should do, and is easy. *MAKE SURE YOUR CAR IS NOT HOT WHEN REMOVING A RADIATOR CAP* When air enters the closed/pressurized cooling system, the air ends up in your reservoir tank and bubbles the top. ! Chris

Hey L==Either the engine coolant level is extemely low or the temp sending unit is incorrect. Make sure the radiator is full of coolantWHEN THE ENGINE IS COOL. If it still does it, have the temp gauge checked. GoodluckJoe

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Tough to narrow it down with such little detail, but it sound like your car's thermostat may be malfunctioning and not controlling the temperature correctly.

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if the coolant in the overflow rises and overspills when you shut the car off or is boiling in the reservoir

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Higher pressure raises the boiling temperature of the coolant.

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Sounds to me like you have a leaking head gasket. Take the car to a good mechanic and have him check it out.

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The water and coolant is put in the coolant reservoir for the location of this refer to the owners manual. It is best to do this when the engine is cold otherwise you run the risk of getting boiling water all over you. the mixture of coolant to water should be about 50/50.


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