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Pontiac Repair/heater issue


My girl friend has 2004 pontiac Gran Prix, with a V6 engine and the heater doesn't work when driving but blows hot hair when idling.

Hi derek:

any serveice engine soon lamps on? let the car cool down and then check the coolant level in the radiator and overflow tank when it's cold fill the radaitor up and the overflow to the full cold line and start there. If when you take the radiator cap off the coolant looks all rusty it will need a coolant flush you may have debris blocking the heater core up. if the coolant is indeed low then likley places for a leak are the intake manifold gaskets upper and lower and maybe a water pump. that is where I would start looking. good luck :-)

Pontiac Repair

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Todd Puccio


General auto repair,electrical issues,driveability issues,anti-lock brakes,SIR systems,HVAC,engine performance,Gm specific. I have worked at my current dealership since the 1990 model year anything much older than that I have limited exposure to. I do not have very much transmission experience so those question you may want to ask of another expert. When you send me a question let me know the exact make/model/engine and year for the car or suv you have it makes it easier to answer the questions that way. If your happy with the answer I gave you please feel free to Donate. This is a free service to you and I am not compensated at all by this web site. I have 22 years of experience to share with you and my knowledge wasn't free to me. I had to pay for my education.


Experience in the area: I have been a technician in GM dealerships for over 22 years and I am a ASE master technician. I work at a Buick and GMC truck store Previously I worked at a Pontiac GMC store for 18 years. I Served a a lead technician when dealership was on a team system. I just recently moved to a Buick,Hummer,Saab Store when my franchise was purchased by this dealership. Organizations: ASE master technician


Education/Credentials:High school diploma,2 year vocational school degree 2 year college degree. Associates degree in applied sciences (auto technology)Awards and Honors: GMC master technician

Awards and Honors
Master GMC truck technician Master ASE technician in 9 categories

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