Last post on Jan 05, 2013 at 8:46 AM
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Pontiac Grand Prix, Sedan
#177 of 217 2007 Grand Prix blower but no heat
Jan 12, 2011 (6:42 am)
Purchased 07 Grand Prix a few months ago in the summer. Not that I am using the heat, I am having problems. Blower works fine, but no heat, barley warm enough to defrost windshield. Sometimes if you let it run awhile, drive a bit, then stop for about 20 mins, sometimes we have heat. The more times you stop for a bit, the more heat you have. Have changed thermo w/ GM part, also had system flushed and filled. Still no help...any ideas? Thinking heater core, but passenger side does not get wet. Please help someone it is -5 her in KC today, heat would be great.
#178 of 217 Nothing Coming out of Vents
Jan 19, 2011 (11:15 pm)
My heat stopped working consistently about a month ago in my 2002 Grand Prix SE, at first I was able to kick around underneath the dash and it would come back on, so I just assumed something was loosely connected, but it has eventually since died out and nothing will come on at all. No air is blowing out of any of the vents whatsoever, hot or cold. I have no other issues with my car, just this situation with the heat and in the middle of winter dealing with below 0 temps most of the time, it makes not only for a cold drive, but near impossible to see with how frozen my windows get. I bought a little dash defroster/heater that plugs into my 12v as a temp fix, and have an appointment scheduled with the mechanic in a few days as I cannot handle this anymore with the cold temps outside. Any idea what could be the main culprit?
#179 of 217 Re: Nothing Coming out of Vents [jenwinn1984]
Jan 20, 2011 (3:21 am)
I have two possible solutions for you. First, a $10 part - check the blower motor resistor. It is located behind the AC motor, kind of hard to get at but with small hands its not too bad. You can google images and schematics. Second, and seems to be a consistent problem with the Grand Prix, the ignition switch. Sounds odd, but apparently all the wiring runs through this switch (where you put the key in). Be aware that if this is the problem, the next issue you will have is that the car will intermittently not start at random times. Good luck.
#180 of 217 Fan Switch 2002 Grand Prix
Jan 28, 2011 (5:06 pm)
Fan does not work in settings 1 and 2, but 3 - 5 work just fine. Does not matter if for AC or heat. Is this the switch or some other relay? Is it an easy fix?
#181 of 217 Re: Fan Switch 2002 Grand Prix [burnsz]
Jan 29, 2011 (2:31 pm)
The simple fix for my situation, which is very similar sounding to your problem was the ignition switch. Once I changed it out the rear defroster, daytime running lights, fan and A/C all worked as if they were new. GM mechanics wanted to change out the relays and resisters $150 a pop plus labour, I'm glad I found the solution on this forum. Good Luck!
#182 of 217 Re: Fan Switch 2002 Grand Prix [beamer22]
Jan 30, 2011 (11:51 am)
I have read the previous message regarding this issue and it seems often that the ignition switch was the problem for many of the electrical issue on the dashboard. I presume this is the switch on the steering column and that it is relativley easy to replace yourself. Are there any special tools required (I read an ice pick was handy)? I am not having any of the other electrical problems, just the fan in positions 1 and 2, 3-5 work fine.
#183 of 217 Re: Fan Switch 2002 Grand Prix [burnsz]
Jan 30, 2011 (11:57 am)
The one thing I would caution on replacing the ignition is to remember that the key (depending on year) has a computer chip. If you have to replace the key it will cost a lot more. Unless you can figure out a way to bypass Pontiac.
#184 of 217 Re: Fan Switch 2002 Grand Prix [burnsz]
Feb 05, 2011 (7:16 am)
That happened to my 2003 Pontiac Grand Prix, eventually the 4 stopped and yesterday nothing at all.
I had the dash torn apart and was told that Pontiac did not put the cabin filter in so there was dirt and paper in the fan. He cleaned it out but never got around to getting me the part I needed to repair it.
#185 of 217 Re: Fan Switch 2002 Grand Prix [beamer22]
Mar 02, 2011 (8:31 pm)
What I want to know does this ignition switch problem also go for the newer grand prix's I have a 04 and my heat/defroster/air also only works sometimes. Then when I need it too work it makes a clicking sound like it wants to come on but never does anything. So I should I have my ignition switch replaced as well
#186 of 217 2004 grand prix
Mar 02, 2011 (8:33 pm)
I've read all these post about the ignition switch on older models of the grand prix dealing with the heat and defroster. Does this apply to the newer models as well? I have a 04