Question about 1999 Pontiac Sunfire

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Cooling system and thermostat location. having problem with overheating and need to know what could be causing this.

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First look to see if anything is blocking the radiator on both sides that may be causing limited airflow. if nothing is blocking the radiator make sure the fan works. let the car warm up and wait to see if the fan turns on when it starts getting hot, but dont let it overheat. if the fan does work then it might be a stuck thermostat. the thermostat is located on the back side of the engine below the exhaust manifold. there is a downpipe for the radiator and there should be two bolts the you have to take off and the thermostat is between those two pipes. if the thermostat is replaced and you still have a problem with overheating it could be internal and i would suggest having it looked at as soon as possible. hope this helps and good luck! i had the same problem and mine was the thermostat. oh and one more thing, if you are going to change the thermostat yourself i would recommend putting the car on ramps at the very least due to the location of the thermostat. i had a lift which makes things a lot easier, but i think that ramps would do.

Posted on Dec 01, 2010

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