Question about Pontiac Grand Am

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I have a 99 pontiac grand am and the anit frezze keeps on overflowing out of the car (I was told from the over flow vaule) I had the thermostate and water pump and the gasket. The fans only come on when I have the heat or ac on. and with them on it doesnt over heat and it will start to if I sit at a light for a while. I was told now it could be the fans or radiator. can any one tell me what you think. Thanks

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The thermostat is responsible to activate the fan whenever the engine temperature reaches 1/2 way through on the indicator. It does not matter if you are sitting in traffic or not here, but if you mentioned that when you sit in traffic you notice temperature going up then it seems that either your thermostat is not sending the signal to the fan or else you have a faulty fan.A quick fix would be to disconnect the wiring to the thermostat which will make your fan run permanently. It's safe to prevent an engine from overheating or else you may have permanent damage to it.Hope this helps.

Posted on Apr 26, 2010


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Within 5 min is fast, this could be a thermostant thats not opening but i may want to have a block test done. this test will tell you if exhaust is entering the cooling system and stopping the flow making the engine overheat as fast as it does. before replacing a thermostant i would make sure its not a headgasket problem first. this test is easy and not expensive to do, with a fluid and the tester tube connected to top of radiator the fkuid turns from blue to yellow if exhaust is entering the cooling system. this is the first thing to do and if it passes this test then i would replace the hermostant. another thing i have found with these engines is that the intake manifold gaskets leak. make sure the cooling system is full and has no air in the system. there will be a few thing s to check if it passes the block test, for example runnuing the engine and when it starts to heat up the bottom hose and the top hose should be close in temp and if the fans are turnning on when it get up in temp.but first is the test then the thermostant assuming the cooling system is full first.hope this is helpful good day.

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