Last post on Jan 05, 2013 at 8:46 AM
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Pontiac Grand Prix, Sedan
May 03, 2010 (7:29 pm)
I have 1998 Grand Prix GT the heater blows only hot even when set to cold. My rear defog and air conditioner buttons don't light up . any ideas
#168 of 217 Re: 2005 Grand prix blower fan issues [nimitz2]
Sep 07, 2010 (4:54 pm)
I have a 2006 Pontiac Grand Prix and have had the same problem occur in 2008 and again just a few days ago. Both times it was the A/C Power module that had to be replaced. When I replaced it in 2008, there was a service bulletin about the problem, but no bulletin this time according to the dealer. There is an obvious problem with this part, as I just picked my car up today and after driving for 30 minutes, the problem re-occurred. At least this time it will be a warrantee repair, but that doesn't make up for the inconvenience. Good luck!
Oct 02, 2010 (8:45 am)
Replacing the blower motor resistor/relay assembly on the 2001 Grand Prix only solved getting the motor to run on #5. The main electrical wire to the ignition switch sounds like the culprit. I got my diagrams from Autozone.com to help diagnose the switch. All voltage from #1 thru #5 from the switch was slightly less than 12 volts but still managed to pull the relay in for the high-speed fan. All other positions from 1 thru 4 turn off the auto headlights and no blower motor action. If you ask me GM should have a safety recall on all vehicles with this type of set-up. There is no reason to loose headlights while driving and trying to keep warm or cool.
#170 of 217 Re: Busmechanic [busmechanic]
Oct 04, 2010 (4:12 am)
You need to replace the ignition switch! As crazy as it sounds that is your problem! You see all the voltage rubs through the ignition switch. If the there is a disruption of voltage running through the circuit the ECM won't allow the blower to operate at 100%. It's fairly easy to do, but make sure you don't damage the Pass Key III, to take it off you will need to use an ice pick or something like that to remove it. I replaced my ignition switch and it solved all my blower problems!
#171 of 217 Re: Busmechanic [dfarinha]
Oct 04, 2010 (1:20 pm)
Thank you. No, it is not so crazy. I did quite a bit of research on many forums and came to that same conclusion. Unfortunately for me, I took the car to a mechanic and I can't seem to find the original key with the computer chip in it. So, it is going to cost me an extra $150 for that. I suggested to him that replacing the ignition switch and getting a new key should all be a one step process.
I can't believe that Pontiac hasn't called in a fix on this. I can't tell you how many people I have seen with the same problem: that stupid leaky area between the hood and firewall, water gets in and, well, you know what they say about water and electrical stuff - they just don't mix.
#172 of 217 blower works no heat. 2001 grand prix gtp
Nov 01, 2010 (6:17 pm)
my blower is working fine but now heat. The car was acting like the thermostat was going out this morning. when I started the car it wen directly to half way on the therm. blower was working no heat. Once the car got to danger area the heat started to work. changed the thermostat after work and the heater doesn't blow hot.Any ideas?
#173 of 217 Re: blower works no heat. 2001 grand prix gtp [mrsooner]
Nov 02, 2010 (4:53 am)
Check your coolant level, and also I had the same problem and it was a cracked radiator cap! cheap fix!
#174 of 217 blower only on 5 and pass heat not working
Dec 04, 2010 (12:42 pm)
i changed the ign. switch delco about 100.00 and two hours not that bad.
#175 of 217 Re: blower works no heat. 2001 grand prix gtp [dfarinha1]
Dec 04, 2010 (12:43 pm)
if you are using dexcool and have not changed it it could be a clogged heater core had that problem with 98 Tahoe.
#176 of 217 Re: blower works no heat. 2001 grand prix gtp [jasonbouldin1]
Dec 16, 2010 (12:01 am)
so a good sys flush could help? no heat, and now in the upper 20's, damn cold ride to work and back.