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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2004 grand am, 3.4 l. It starts out cold, coolant is full, and within 5 minutes ithe gauge spikes, it overflows out the over flow hose. It will spike and then come on down. No excessive heat comes out...


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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1 Answer

My 2004 sunfire has be over heating lately it has pleant of anit-frezze but it still dose and the fan is workn idk what else to do plz help get back at me asp.


It has the symtoms of the thermostat being stuck in the closed position. Feel the upper radiator hose and see if it's getting hot (from the coolant passing through it)

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Antifreeze keep coming out of my overflow on my 1999 alero olsd.. i chnge the water pump , radiator, thermostate , and no milky in oil,, it did nt over heat what else coud it be/


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is the car running hot check thermostat it could not be opening make sure you dont over flow resivoir tank fill it to the proper level

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Change the thermostate, if that doesn't work it might need a new water pump and new hoses. Try getting the radiator flushed.

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engine cooling should be a close circuit. there should have not over flow. however, the is a over flow container in the from of the car to catch any overflow.
the little tube may be the overflow tube that suppose to go to the overflow container.

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It sounds like your water pump may have gone bad. The water pump pushes the antifreeze through the engine, heater core and Radiator which is regulated by the thermostate. Sorry for the bad news but i hope this helps, and Good luck

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It is probably the problem. To make shure that need to change the gaskets, one of the symptoms use to be thet the temp rises when you are running at speed 50+ average, where is supposed that the car gets a lot of air due by the speed and nobody thinks that will be overheated.

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