Question about 1999 Pontiac Grand Am GT

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No heat when i turn the car on and it is warm, running al least 1/23 hour, i turn the heat on, and only cold air comes on, could it be the thermostat or ??

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  • Anonymous Jan 17, 2009

    cold air even when the gauge says the car has been warmed up

  • labaez Jan 24, 2009

    I had the same problem, pass tense. I havle a 99 GT 3.4 liter 6 cylinder that my husband started the warming process on a cold morning accept I think he forgot he started it and left it running idle in the drive way for at least 30 mins. when I went to the car it just registered that it was warm but not overheating. I got in the car and left only to get around the corner and noticed smoke (white) the car seemed very heavy and hesitant an I could clearly tell something was drastically wrong. I took it back home and parked it. The inevitable had happend. After towing to a shop I found that my head gasket had blown and I had leaked antifreeze into my first cylinder. I was devistated. To date, the car is parked in my garage. As I morn the loss. I sit and think of my next move. I don't have all the funds to fix it yet. But all of the issues listed lead me this far. We had already change the thermostat and only use the dex-cool antifreeze. I have the cold air issues as well. In dead of winter. Sign rest in peace.

  • Shane Peterson May 11, 2010

    hi there! I have an answer for you, but first I need to know the following:




    1. what size is the engine?

    2. have you had recent cooling system work done?

    3. have you ran the engine at operating temp (about 205* F) for at least a 1/2 hour?

    4. Is the cooling system full?

    Get back to me with this info, and I get you a very detailed answer that WILL solve your problem

  • 4fawcett May 11, 2010

    have you checked the antifreeze level

  • Curt Downs May 11, 2010

    What does the engine temp gauge indicate after the car is fully warmed up? Is it in the low range?

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  • 61 Answers

The 3400 is notorious of the head gaskets blowing. this may not be in your case. Check the level of the coolant. Their may be air in the heater core. bring it up to operating temp then check the level.

Hope it is just air in the system not the heads!

Posted on Jan 27, 2009

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