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Pontiac Grand Prix Heater blower relay switch

216 messages,  Last post on Jan 05, 2013 at 9:46 AM

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What is this discussion about? Pontiac Grand Prix, Sedan

Messages Page 12 of 23

#102 of 216 1999 Pontiac Gran Prix blower motor control module by bearmde

Oct 07, 2008 (4:59 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.

#103 of 216 Re: 1999 Pontiac Gran Prix blower motor control module [bearmde] by harleyhop

Oct 14, 2008 (5:59 am)

Replying to: bearmde (Oct 07, 2008 4:59 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.

#104 of 216 2000 Grand Prix GTP Blower Motor Control Module by jataylor300

Nov 13, 2008 (3:51 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 216 Re: 1999 Pontiac Gran Prix blower motor control module [harleyhop] by Gerrit

Nov 24, 2008 (5:30 am)

Replying to: harleyhop (Oct 14, 2008 5:59 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?

#106 of 216 Re: 1999 Pontiac Gran Prix blower motor control module [Gerrit] by gkretchmer

Nov 28, 2008 (5:33 pm)

Replying to: Gerrit (Nov 24, 2008 5:30 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 216 fan moter resistor cover by Piggseye

Dec 08, 2008 (2:33 pm)

Does anyone know where the fan motor resistor is located in grand prix se, 2002

#109 of 216 2004 Pontiac Gran Prix blower motor control module [Gerrit] by KAY65

Dec 17, 2008 (10:50 am)

Replying to: Gerrit (Nov 24, 2008 5:30 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 216 2004 Pontiac Grand Prix Blower Problems by KAY65

Dec 17, 2008 (10:51 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.

#111 of 216 More of the Same Plus by lberg

Dec 17, 2008 (6:43 pm)

1st the ignition switch would not go back to the off position but I'm able to stick a screwdriver up the hole under the column..works good
2nd gas gauge freaks out..up and down..have to watch my trip odometer
3rd the radio digits go haywire the come back
4th winter and I freeze windows up on inside
5th blower doesn't work..managed to " unthaw " it and worked..sort of
6th now it only works in the 5 position
7th Sell this 2001 Gran Prix???? Kinda depressing

Messages Page 12 of 23

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