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Pontiac Grand Prix Climate Control/AC

192 messages,  Last post on Oct 07, 2009 at 12:19 PM

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What is this discussion about? Pontiac Grand Prix, Heating / Cooling, Sedan

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#184 of 192 another anomoly on grand prix by bearmde Oct 07, 2008 (3:55 pm)
I just finished replacing the heat resistor module on my 1999 Pontiac Grand Prix that everyone states is needed to get fan speed 1-4 working. My car will work on five only. Well it still only works on five only. I tested the switch by using a jump wire from hot to make sure 1-4 are working and the switch is good because it still does not work. Now I have been told that it is possibly a blower motor control module. This module is on drivers side, by left leg, near outer panel of door. It is also a very expensive part. It seems the switch relays are small, and they go through this module to a set of stronger relays then on to the heat resister module. Has anyone ever heard of this going bad and are there any after market ones that are available. The next issue, is still with the blower. With the lights set to come on automatically like most cars are today, if the switch is off, the lights will come on. The second that you turn the blower switch to 1-4 the lights will go off, and only come back on by going to off or 5. Somehow this is all tied together. Any ideas from the experts on this panel. Thanks. Replies to this message: jfissh (Sep 28, 2009 10:37 am) rgh1016 (Sep 28, 2009 1:27 pm)
#185 of 192 Broken hot/cold switch on 200 grand prix gt by billyshr Nov 08, 2008 (9:14 am)
I have a problem. no heat in my 2000 grand prix i changed the thermostat then noticed the knob and switch that changes the temp of heat/air was broken . does anyone know how hard a fix especially pulling the dash. I noticed in other forum on switching radio that when you pull down the dash there is still more dash to take off to get to switches. any help would be appreciated alot . also what other issues could i have if that is not the problem thanks bilyshr
#186 of 192 Re: Climate Control Problem - 97 GTP [jakedave] by dmen921 Dec 10, 2008 (11:57 am)
Replying to: jakedave (Apr 24, 2008 6:50 am) Hey there jakedave,        Just wondering if you ever found a resolution to this problem. I'm having the same problem with my 2000 GT. Thanks   Dave
#187 of 192 outsde temp control not working 2000 Grand Prix GT by dmen921 Dec 10, 2008 (12:02 pm)
I have a problem with my climate control. The external thermometer reads the wrong temperature, which makes the climate control not work either. For instance, yesterday the actual temp was around 70 degrees, and my thermometer read -6, so it will not turn the a/c on or anything, and it happens once in a while the opposite way too (like it will be zero outside and the temp will read like 90, so it wont heat properly). Any ideas. Thanks guys
#188 of 192 2000 Grand Prix Driver Side Blend Motor by publicmsu Aug 06, 2009 (11:04 am)
2000 Grand Prix with the cj2 (automatic) climate control system. I was receiving the blinking man on my HVAC head, so I checked the diagnostics through the cj2 diagnostic mode. I was receiving a current code of 05 which indicates driver side fault on the blend actuator. I replaced the part and while doing so, plugged it in just to see if it worked, without having it hooked up to the actual blend door. The motor never moved, no matter which temperature was selected on the driver's side, but the current code went to history (good). Now I am trying to decide what my next point of attack is. I do not have any current codes (105 is there, but history), and my driver's side blend door does not move (cannot hear it, but can hear the passenger when adjusting the temp). I also noticed that my driver side backlight that illuminates the dial for driver's temp is no longer illuminated. I assumed this was just a burned out bulb and the system was still fine. Now I'm starting to wonder if this is another diagnostic that's trying to tell me there's bigger problems with the driver's side HVAC control? Has anyone encountered this loss of backlight?   As another side note, I'm wondering if it's worthwhile replacing the interior temperature sensor. I've already replaced the exterior ambient sensor, as that was way off; that is working fine now. Just trying to get my HVAC system back into original working order.   Thanks
#189 of 192 Re: another anomoly on grand prix [bearmde] by jfissh Sep 28, 2009 (10:37 am)
Replying to: bearmde (Oct 07, 2008 3:55 pm) I am having the same problem. Did you ever get it fixed? Replies to this message: rgh1016 (Sep 28, 2009 1:27 pm)
#190 of 192 Re: another anomoly on grand prix [jfissh] by rgh1016 Sep 28, 2009 (1:27 pm)
Replying to: jfissh (Sep 28, 2009 10:37 am) If you are referring to the problem of unbalanced cooling output between the driver and passenger outlets, I found debris in the metering valve that apparently came from the compressor when it failed. After changing the metering valve, the difference in temperature between the driver and passenger outlets was about 6 degrees when the controls were set to 60 degrees and that's probably within spec. That's much better than the 20 degree difference I had been getting. The amount of debris in the metering valve certainly didn't appear to be enough to cause this much of a cooling difference so it must be very sensitive to obstruction.   Ray
#191 of 192 AC kicks on when I start my car by gp76 Sep 29, 2009 (3:46 pm)
I have a 05 Grand Prix with two problems,The first is it wont start on the first crank every time unless I push on the gas.The secound is the A/C kicks on when it does start every time no matter what the temp is outside, even when its not on auto.I have cleaned the ground to the body and the battery termals and I have no codes flashing anybody got any ideas?After reading the post on here I see the A/C is a problem that may not have a fix that stinks.
#192 of 192 Re: Weak Air Flow in Vents [jebn] by xwilox Oct 07, 2009 (12:19 pm)
Replying to: jebn (Sep 25, 2007 11:22 pm) Hey Wayne I have the same problem only 3 years later 2009. Did you ever figure the solution to yours. If you did please post the solution. Thanks.

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