Question about 1999 Pontiac Grand Am GT

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99 GrandAm still overheating after replacing comon problem parts.

I have a 99 Pontiac GrandAm GT, 3.4L. I have done a radiator flush, put in a new thermostat, coolant temp sensor, and new water pump and I am still overheating. I have looked very closely and do not have a blown head gasket. I only get heat out of my vents when my car is in park and I am holding my throtle at a steady 2500 RPM's. What else can I do to fix my car?

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  • toriandnick Sep 29, 2009

    How would I bleed the air from the system? And for the head gasket, I took it into a GM dealership and had them check run their test on it. Oh, and I also replaced the resevoir cap with a brand new one thinking the old one was pressurizing correctly.



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I had the same exact problem(s). My problem was blown intake gaskets. I had a mechanic look at it. He raised the hood and said "simple, you have blown intake gaskets". My car does not overheat now, even though V6 does run about 200-215.

Posted on Nov 14, 2009

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Did you bleed the air from the system? how do u know u don't have a leaking head gasket, have u had it checked with a gas analyzer?

Posted on Sep 29, 2009

  • yadayada
    yadayada Sep 29, 2009

    the generic method is to use a floor jack and raise the front of the car as high as poss, then fill the coolant recovery tank full and run the engine until it just starts to overheat, high end of normal zone on gauge, then shut the engine down and run cold water over the radiator core, this will self bleed the system and the coolant will be pulled from the recovery tank, repeat as necessary, never let the recovery tank run dry or more air will be pulled i9nto the cooling system, if it still overheats then you need to have the head gaskets checked with a gas analyzer for hydrocarbons present in the radiator or recovery tank.


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Check the two small hose coming from the overflow tank my got blocked this worked for me.

Posted on Nov 13, 2009

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