Last post on Nov 18, 2013 at 11:03 PM
You are in the Pontiac Grand Prix
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Pontiac Grand Prix, Heating / Cooling, Sedan
#18 of 44 Re: 2006 Grand Prix - fan not shutting off when car is off [tarah88]
Nov 25, 2011 (9:18 am)
Similar Problems with 2007 Pontiac Grand Prix Heater / AC. This past summer the A/C worked but sporadically it would act like the blower was not working and shut off then come back on when it was 113 degrees outside. Then this fall it acted like no heat when I first tried the heater. Now we are nearing December and the defroster on both sides blows cold air no heat at all and after about 20-30 minutes the heater may blow a little warm air out the front vents only. But then if I turn on the defroster it is cold again. Any suggestions?
#19 of 44 Re: 2006 Grand Prix - fan not shutting off when car is off [gporter2]
Nov 25, 2011 (10:23 am)
I'm sorry to hear about your HVAC concern, especially as cooler weather is rolling in. Have you worked with a dealership already towards resolving this?
GM Customer Service
#20 of 44 Re: 2006 Grand Prix - fan not shutting off when car is off [tarah88]
by MrShift@Edmunds HOST
Dec 01, 2011 (8:29 am)
This is a common problem and my research indicates that in *most* cases (no promises here), replacing the resistor under the glove box will fix the problem.
HOWEVER, there are reports that this resistor goes back on occasion because of water leaking onto it from a bad windshield seal, so you should check to see if the resistor is full of corrosion from water damage---if so, you have TWO problems to fix, or you'll be back under there soon enough.
#21 of 44 Re: 05 grand prix ac/heat problem [grumh]
Jan 10, 2012 (1:26 pm)
No, I emailed you more specifically about the problem that I am having.
#22 of 44 Re: 2001 Pontiac Grand Prix fan won't shut off! [gearkat]
Jan 10, 2012 (1:32 pm)
I was never able to find out the problem with my car as I am still dealing with it. As with many other people, I have read several post and have no idea where to start. I have talked to mechanics and tell them about the ignition switch and they have never heard of that or at least tell me no. But I have replaced every other part that I can think of besides pulling the wiring from the dash which is hundreds of dollars that I don't have. I have no idea what to do. I am looking into buying the a/c controls on the center dash board but I am not sure. Haven't had A/c or heat for months now.
#23 of 44 where can I get a wiring harness
Jan 17, 2012 (12:09 pm)
I am still having the same A/c issues as before and I would like to know where to get a wiring harness for a 2005 Pontiac Grand Prix. I replaced the blower motor resistor, but I think I fried the wiring harness when the initial problem happened, hence the smoke in the vents. Can someone help me? I know my way around a car pretty well. I also need an instruction manual.
#24 of 44 a/c heater staying on
Mar 22, 2012 (8:26 am)
Did anyone sever find the solution for the a/c heater staying on after car is off? I've tried everything except ignition switch.
#25 of 44 1998 Pontiac GP GT AC/Heater Problems
Apr 23, 2012 (12:21 am)
I have a 1998 Pontiac Grand Prix GT and I have read a lot of discussions about AC/Heater issues from various websites. I have yet to find one issue similar to mine current problem or maybe I just didn't look hard enough. Anyways when I have my heater on the driver side vents blow out cold air including the floor ones and my passenger side heat works fine. When I have the AC on the driver side works great and the passenger side blows out hot air like as if the heater was turned on high. I have played with the temperature settings to see if I can get it to work even a little but had no luck. The weird thing is sometimes by chance the heater will work fine on both sides but this is rare. I don't know if this information matters but I had my AC recharged and a couple of months later my AC/Heater problems arose.
#26 of 44 Fan turning off and on
Jul 23, 2012 (2:07 pm)
I have a 2004 pontiac gp. In recent months the internal fan has been acting up. It will turn off and on on its own and stubbornly refuses most of my coaxing. I have taken it into a mechanic as I dont have the ability to repair it myself at the moment but they keep giving me conflicting reports about what the problem is. So far I have been quoted at 50 dollars for a small fill up of coolant which I was told is not very low and no leak. Then I was told by the same mechanic that it was all my fans and my car would become damaged if i didnt fork over 400-900 dollars for a full repair. I sadly had to burst his bubble on that fact since I know the engine fan works fine as I can check it for myself without removing the dang dashboard. Then yet again was quoted 300 dollars to check the resistor which is now what he swears the problem is. All this after he has ran a diag on it. Is there anyway to get to the resistor under the glovebox without pulling the dash? I do not own a repair manual for this car yet so any help locating it would be awesome! thanks
#27 of 44 Re: 1998 Pontiac GP GT AC/Heater Problems [chica85bb]
Jul 26, 2012 (6:30 pm)
your problem may not be your wiring, or your blower motor... it sounds like it's in the vent flap system. Your car is new enough to have that system electronically controlled (as on a 1993 Dodge Intrepid I once owned) It may need a simple calibration. On the Dodge you pressed and held three buttons at once (or some similar act) and the vent doors cycled through all their full open / closed positions. It's like calibrating a joy stick on a computer. You set the range of motion of the doors so they know where they're sitting.