Question about 1999 Pontiac Grand Am GT

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Car overheating I changed the thermostat three weeks ago now the car is doing the same thing overheating, hearter blowing cold air, coolant just bubbles in tank

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  • Anonymous Jan 13, 2009

    I have spent so much money trying to find the root of the problem. I am so FRUSTRATED. I have replaced the coolant fan and relay, the thermostat, manifold intake gasket, radiator and water pump and my car is still overheating and will not keep any coolant in it. I just need to junk it.



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Bubbling coolant in the overflow tank is a sure sign you have a bad head gasket. The V6 has two heads and accordingly, two head gaskets. It is a lot of work, not something a lady would want to tackle. Factory head gaskets were unconventional on GM V6's, being extruded rather than a one-piece gasket laid in place before the head is installed. The head gasket is there to ensure a good seal for each cylinder for good compression, a good seal for the water jacket so coolant can flow through the heads and engine block (where yours is having a problem, compression is being forced sideways over into the water jacket) and oil supply and drain holes go through the head gasket as well. A backyard mechanic can do this for you cheaper than a big shop or the dealer. If the car is otherwise in good shape and you like it, I'd fix it.

Posted on Mar 25, 2012

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You have to change your Heater Core. Your Antifreeze moves in a circular motion from Radiator to Thermostat through engine to your heater core back to your radiator. If there is no circulation, your engine is going to overheat. I had the same problem with my Pontiac Grand Prix.

Posted on Nov 23, 2008

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