Last post on Jan 05, 2013 at 8:46 AM
You are in the Pontiac Grand Prix
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Pontiac Grand Prix, Sedan
#99 of 217 Re: 99 GP blower problem [rrogan1]
Aug 11, 2008 (12:44 pm)
This may not solve your problem, but it may help get you on your way:
My blower gradually started failing on each of the fan settings (last1 being #5, then failed on that, too).
I still have my blower not working on my '02 grand prix, and i've done the following:
put 12 volts directly to the blower equaled it was good!
I then replaced the resistor (twice, to make sure), and it was also good.
****I then thought to ck the voltage after the resistor, going to the blower, and it read (trying it at ALL the fan settings) 6.5, to about 7 volts (=not enough for the blower to work!!).
A mechanic i spoke with said that it sounded like the voltage was 'shorting' somewhere, and that i should ck the voltage at the fuse panel.
He said if the fuse was getting 12 volts, then the short was 'after' the fuse panel (either between the switch & the panel, or the switch itself).
I mentioned this thing about others having the problem behind the steering wheel (eg, the wiring, ) & he said anything is possible.
Keep in mind, if it's in the ignition wiring, you'll have to take a lot of things apart (if it's the switch, even more!).
Consider also, the dex-cool/gasket problems (i'm selling the car!!)
*****Has anyone else taking readings & gotten low voltage after the resistor (going into the blower)???
What caused it????
#100 of 217 Re: 99 GP blower problem [craig32]
Sep 23, 2008 (5:22 am)
Had the same problem as most above on my '02 Pontiac Grand Prix GTP - blower not working, puddle in passenger side, everything else works fine. Only had to replace the blower ($90) not the resistor. Replacement not too bad with the right type and length of tools.
#101 of 217 2003 Grand Prix Radio then ac goes out
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?
#102 of 217 1999 Pontiac Gran Prix blower motor control module
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.
#103 of 217 Re: 1999 Pontiac Gran Prix blower motor control module [bearmde]
Oct 14, 2008 (4:59 am)
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 217 2000 Grand Prix GTP Blower Motor Control Module
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 217 Re: 1999 Pontiac Gran Prix blower motor control module [harleyhop]
Nov 24, 2008 (4:30 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 217 Re: 1999 Pontiac Gran Prix blower motor control module [Gerrit]
Nov 28, 2008 (4:33 pm)
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 217 fan moter resistor cover
Dec 08, 2008 (1:33 pm)
Does anyone know where the fan motor resistor is located in grand prix se, 2002