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Pontiac Grand Prix AC/Heater Fan issue

I have an issue with the AC/heater fan that seems a little different from the other threads here. I have a 97 Grand Prix GT without climate control.

No matter what settings I put the fan on, I get nothing more than just a trickle of air out of all the vents (defog, head, feet). When I change the speed settings, the fan gets louder, like its trying to blow air harder, but still nothing more than a trickle of air from the vents. Changing the vent selector doesn't affect the airflow out of any of the vents. If I turn on the AC, it seems like the trickle of air does get cool eventually, but not nearly enough to make the car comfortable.

Has anyone seen this issue, and can point me in the right direction to fixing it?



  • i have an 02 izuzu trooper who's blower motor works only after driving about 20 minutes or more. you can turn car off, and the blower will not work again for several more minutes. sometimes it startes right up with car. fuses, relays and wireing all check out! really need defroster. colorado
  • my heater only works on 5.what can i do to fix this?
  • my heater only works on 5.what can i do to fix this?my car is a 2000 pontiac grand prix
  • I had this problem and I had a mechanic replace the ignition switch after reading other forums.
  • I had the same issue with my 2001 Gran Prix GT, in my case not only the AC, blower fan and daytime driving lights and auto headlights plus my rear window defogger. It turned out to be the ignition switch. All these components work through it. Once replacing the ignition switch it solved all my problems especially the fan just working on 5.
  • bmsmith7499bmsmith7499 Posts: 1
    edited August 2010
    I have a 2001 Pontiac Grand Prix GT and my fan will not shut off. It will continue to blow constantly even with the car turned off. I have to unhook the battery to get it to shut down. I recently put in a new battery and it worked fine for about a day. Any ideas? :confuse:
  • i have a 05 grand prix gt. At any given time that you start the car the ac/heat wont come on. no blower, no noise no nothing. as for other times it works just fine. I ve read so many post that i don't know where to start. anyone have the similar problem that has had it fixed? where should i start?
  • gearkatgearkat Posts: 13
    I have the same problem, and instead of unhooking the battery I simply pulled the 30 V HVAC fuse in the glove compartment fuse box to get it to shut down.
  • bmsmith, I've got a 2002 Grand Prix. My fan is staying on too. Were you ever able to find a solution to this problem?
  • I have a 2005 pontiac and after I had smoke fill the inside cabin because the fuse blew, I replaced the blower motor and resistor. That worked for about 2-3 weeks and then blew just last week. No smoke this time. I can hear the compressor and other parts turning on underneath the hood, and there is a little air flow and its very cold, but nothing more. I'm not sure if its a short in the wiring, bad parts, or the a/c cluster on the dashboard, but something isn't right. Any ideas?
  • grumhgrumh Posts: 1
    Did you ever find out what was causing the intermittent behavior? I have the exact same problem now!
  • Grumh (and bimmerman94),

    Thanks for posting, and I'm sorry to hear about this concern you're having with the HVAC. We can look We can look into the situation further (see if any recalls are associated to your vehicle specifically/help you work with a dealership towards resolving this concern). Please email us with your name/user name, contact information, the last 8 of your VIN, and your involved dealership.

    GM Customer Service
  • Somebody please help me! My 2006 Grand Prix started giving me some problems last winter. It would blow air, but not get very hot. I let it go because I didn't want to deal with it. This summer on a hot day, the fan wouldn't even turn on for most of the day. Finally, it started blowing nice cold air. This happened sparatically throughout the summer. Now we are back to winter and it's the same thing....not getting hot air. But now I have a new exciting issue. The blower won't shut off even when the car is off. I unplugged the battery over night once and the problem seemed to be fixed for a little while. I made the mistake of turning the heater back on and now same issue....won't shut off. Killed my battery last night. I need some good solid advice. I want it fixed right the first time. I've heard so far I need to replace blower motor, then resistor, or try the relay. No one has a straight answer. ADVISE????
  • 2000 Mercury Grand Marquis. Heater blower stopped working. The blower motor control module is probally bad but son does not have money to replace it. The EATC is OK. Can I go out to the blower motor and tap into the wires and run a new resistant switch into car and bypass the blower motor control module. When car is running you can turn on heat and place on defrost and you can feel warm air coming out just no blower to blow it out.
  • Tarah88,

    I'm sorry to hear about the concerns you're having with your HVAC, especially as colder weather is rolling in. Have you been working with a dealership already?

    GM Customer Service
  • 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?
  • Gporter2,

    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
  • Mr_ShiftrightMr_Shiftright CaliforniaPosts: 44,408
    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.


  • No, I emailed you more specifically about the problem that I am having.
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