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Pontiac Repair/1999 Pontiac Grand Prix GTP 3.8L supercharged


My D.I.C and Heater went out randomly but the buttons still illuminate but will not turn on.....Is there any way to fix/repair the issue? I've checked the fuses and they're all fine

Hi Michael.
Dic's going out on those cars were a pretty common for those they are not repairable. look for a used on at a junk yard and hope that one is a good one. as for the HVAC head not to common. I'll assum you have auto air on this being that is has a DIC. did they both quit at the same time? if they did I would kind of suspect a ground issue but if they go out or should I say went out at different times then you more then likely have a bad HVAc control head as well. those are not that common to go bad usually al that happens is the back lighting quits but the head still works OR the blower motor quits working and that is not the head that is usually the blower resistor or control or the motor control module. if it has Auto HVAc it's called a controller for the motor. if it is not auto HVAC it's called a resistor.
Good luck :-)

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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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