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Pontiac Grand Prix AC/Heater Fan issue



  • 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.
  • 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.

    Thank you
  • leena110leena110 Posts: 1
    Did anyone sever find the solution for the a/c heater staying on after car is off? I've tried everything except ignition switch.
  • 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.
  • bobbi209bobbi209 Posts: 1
    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
  • tinindiantinindian Posts: 1
    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.
  • I have a 2006 Grand prix. It has a musty smell from time to time. I know the A/C has a drain tube some where, but I can not find it. My 2000 GP had the typical rubber elbow on the fire wall and I could see it and maintain it from under the car. Can someone shed some light on this? Where exactly is the drain for the A/C on an 06, and is there any other things I should check regarding the odor. My car is not at all wet inside, cabin or trunk! Thanks for listening.
  • My fan does not kick in when Heater /Ac is on, Both AC and heater kick in but no fan, While i drive the car and if i hit enough bumps then the fan comes on, If i turn the dial when the fan is working only high and low settings work,
  • I have a 05 grand prix and my heat stopped working on all speeds then it kicked back in then stopped for good i get a reading on the resistor when i put the battery tester to it iam having troubles finding a spot for the battery tester. also could it be the fuse or the switch?
  • I have a grand prix 2002....the heater used to work only at 5 level...afther a while it stop working at all...i already. Change. The blower resistor and it still dont work...what could be the proble??
  • I have a 2004 Grand Prix and I was experiencing the exact same problem. I did some research and found out that there is a cabin air filter on the passenger side. You have to go under the hood to change it. Once we changed the cabin air filter (different from the engine air filter) the smell went away.
  • Thanks much. Did so, regarding cabin filter along with finding and clearing drain tube. Seems to have worked. Thanks again.
  • I am having the same problems with my 04. I haven't taken it to a mechanic yet but plan on doing that soon. Did you ever end up getting the problem fixed and if so what was it and how much was it?
  • jreck87jreck87 Posts: 6
    This is a Pontiac Grand Prix forum! go to your own car's forum!
  • Kirstie_HKirstie_H Posts: 10,822
    Well, you're telling that member off about 3.5 years too late. That post was from 2009. Discussions may have been combined during that time, and that member is almost certainly not going to see your message.

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  • jreck87jreck87 Posts: 6
    oh, ok kool and to clarify, i wasnt telling anyone "off", i was just sayin to them. thanks
  • littlesixxlittlesixx Posts: 1
    In my 2001 pontiac grand prix I noticed the other night when i turned on the air condition that my dashboard message center and the automatic headlights went off. I tried a few different settings and nothing. I was just wondering if its as simple as replacing a few fuses or do i have to rip everything apart. any help would be greatly appreciated. thanks!
  • Well u have to do a therough check on wires.harnesses .actual blower motor switch n conections to grounds all over the car for me it was the main harnes behind my radio the plug actually melted the wires on it r easy to find just look under the dash (pass side) locate the blower n follow the wires to behind the radio on the one side of harness connector there is 4 or 6 thicker wires then the rest of the wires in the harness u will clearly c if they r melted if so go to the zone .strauss.or pepboys and get the male n female connectors b sure to secure them correct because they will heat up n if not properly done wires can ark until a fire occurs n we don't want that trust me
  • jdowell76jdowell76 Posts: 1
    I bought a 2001 used Pontiac Grand Am GT. Car drives great but I just had the AC fan blast on full while I was driving. It will not shut off and adusting the controls does nothing. I had to unhook the battery to turn it off. The only things that happened prior to the issue is a car wash (perhaps water leaked into the electronics) and put a cell phone charger into the lighter. :sick:
  • voclovoclo Posts: 1
    Just bought a 2004 Grand Prix GT2 4 days ago- beautiful car! Ran great, everything worked when tested. Dealership replaced the windshield the day we picked it up since we saw it had a prominent stone chip in the middle when we took it for test drive. Picked it up on Thursday; on Saturday the air conditioner wouldn't shut off, not even when car was turned off. Had to pull fuse to get it to stop. Have read the forum- some have suggested a leak that corroded the resistor; others suggested ignition wiring, etc. Wondering if the replacement of the windshield and all the torrential rain we had actually caused this or if its something else. There was no evidence of leaking in the car. Perhaps it just happened to work correctly when we test drove it. Called the dealership but they must have closed earlier on Saturday. Left message for them. Closed on Sunday. Hoping they will make it right but we bought it without a warranty. Not sure how to proceed from here. It's our daughter's car and we/she can't afford costly repairs when money was used for down payment. I checked and buyer's remorse laws don't appear to apply to cars. A mechanic mentioned a recall for this problem, but I checked this as well and don't see one. Any suggestions?
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