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Pontiac Grand Prix Heater blower relay switch

144 messages,  Last post on Nov 16, 2009 at 6:26 PM

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#101 of 144 2003 Grand Prix Radio then ac goes out by elfrieda Sep 29, 2008 (2:36 pm)
On my 2003 Grand Prix, first my radio reception goes out, can only get very close stations, the cd player sounds unbalanced then won't eject cd, finally does eject it one day then I can hear it continually working with no cd.That stopped now. After that my AC started hesitating before coming on, now it will only come on if it is turned on before starting car, any attempt to adjust it, and it turns off. Or... it doesn't come on at all when started, but will come on much later on it's own...or not. What could the matter be? Replies to this message: elfrieda (May 06, 2009 8:46 am)
#102 of 144 1999 Pontiac Gran Prix blower motor control module by bearmde Oct 07, 2008 (3:59 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: harleyhop (Oct 14, 2008 4:59 am) Gerrit (Nov 24, 2008 4:30 am) gkretchmer (Nov 28, 2008 4:33 pm) KAY65 (Dec 17, 2008 9:50 am) gtmn (May 30, 2009 5:13 am) segrandprix (Jun 27, 2009 7:53 am)
#103 of 144 Re: 1999 Pontiac Gran Prix blower motor control module [bearmde] by harleyhop Oct 14, 2008 (4:59 am)
Replying to: bearmde (Oct 07, 2008 3:59 pm) Hi I'm an master auto tech and I recently had this same problem on a 2002 GP the trouble lies in your " Ignition Switch " the orange wire that comes from it feeds the HVAC, Day Time Running Light, Rear Defogger and some others. So I hope this helps you and others with this problem. P.S. I would personally get one from the dealer might cost a few bucks more but worth the piece of mind. Replies to this message: Gerrit (Nov 24, 2008 4:30 am) gkretchmer (Nov 28, 2008 4:33 pm) KAY65 (Dec 17, 2008 9:50 am) gtmn (May 30, 2009 5:13 am) segrandprix (Jun 27, 2009 7:53 am)
#104 of 144 2000 Grand Prix GTP Blower Motor Control Module by jataylor300 Nov 13, 2008 (2:51 pm)
The blower motor on my wife's 2000Grand Prix GTP simply stopped working one morning. Does anyone know if there is both the Blower Motor Control Module and the Resistor pack when the car is equipped with climate control? The on-line and Chiltons manuals I have do not identify what makes up the components of the Climate control system. I can't even find pictures or locations of the resistor pack (if used) or the BMCM. Anyone have any advice re: location and serviceability of these 2 components?
#105 of 144 Re: 1999 Pontiac Gran Prix blower motor control module [harleyhop] by Gerrit Nov 24, 2008 (4:30 am)
Replying to: harleyhop (Oct 14, 2008 4:59 am) Hi, I have a 2002 Grand Prix GTP. Fan speed 1 through 4 don't work. Fan speed 5 works well. No problems with Day time running lights, rear window defogger, etc. Can you confirm that by replacing the ignition switch, I'll have the 4 speeds back? Is there a way to check if it's indeed the ignition switch that's causing the issue? Replies to this message: gkretchmer (Nov 28, 2008 4:33 pm) KAY65 (Dec 17, 2008 9:50 am)
#106 of 144 Re: 1999 Pontiac Gran Prix blower motor control module [Gerrit] by gkretchmer Nov 28, 2008 (4:33 pm)
Replying to: Gerrit (Nov 24, 2008 4:30 am) Look at the dic/hvac fuze behind the glove box cover. If it has less the 12 volts on the fuze with the heater blower motor in a middle position and the head light switch off, with engine running it is probably the ignition switch. If the heater blower runs set to max (5), the blower motor is good. If the blower fails to run on some settings other than 5 but runs on others, and you have 12 volts or better on the dic/hvac fuze, it is probably the resistor pack, located behind the blower motor above the floor on the passenger side. If you pull the blower motor, oil the bearings, and check the drain hole is open (engine side). The dic/hvac 20 amp fuze is shared by many circuits, the day time run lights, seat heaters, rear window defogger, and the fancy style heater accessories, depending on the exact year of the car. All these are fed by the 60 amp ignition 2 fuze in the engine fuze block, then through the 20 amp dic/hvac fuze with the key switch in between. The DLR is located above the parking brake peddle but not much appears to go wrong with that but less than 12 volts feeding the DLR will not trigger the day time lights. Mitchell has a complete wiring diagram I got from the web for around 12 bucks, an actually has all the circuits in the set, something like 50 pages of complex diagrams! I found them here: http://www.ahdol.com The diagrams in the usual manuals from Checkers are worthless, as is who ever designed the heater resistor pack placement at GM for the Grand Prix. Hope this helps.
#107 of 144 fan moter resistor cover by Piggseye Dec 08, 2008 (1:33 pm)
Does anyone know where the fan motor resistor is located in grand prix se, 2002
#109 of 144 2004 Pontiac Gran Prix blower motor control module [Gerrit] by KAY65 Dec 17, 2008 (9:50 am)
Replying to: Gerrit (Nov 24, 2008 4:30 am) I have a 2004 Pont GP. My blower will not shut off even when the engine is not running. It will only blow on #5. I have pulled every possible fuse in both electrical panels and nothing shuts it off. I took it to a mechanic and the only thing that he could do was to disconnect the blower all together. Now, I am without heat & window defroster which is a necessity. Please give me the magic CURE that's not going to cost an arm and a leg. Thanks in advance.
#110 of 144 2004 Pontiac Grand Prix Blower Problems by KAY65 Dec 17, 2008 (9:51 am)
I have a 2004 Pont GP. My blower will not shut off even when the engine is not running. It will only blow on #5. I have pulled every possible fuse in both electrical panels and nothing shuts it off. I took it to a mechanic and the only thing that he could do was to disconnect the blower all together. Now, I am without heat & window defroster which is a necessity. Please give me the magic CURE that's not going to cost an arm and a leg. Thanks in advance. Replies to this message: 348ironworker (Dec 20, 2008 7:16 am) craig32 (Dec 20, 2008 8:03 am)

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