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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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What is this discussion about? Pontiac Grand Prix, Sedan


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#1 of 144
Heater blower relay switch by perplexed3
Jan 22, 2007 (6:37 am)
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I need to locate the heater blower relay switch.My heater only works on 5 and have been told it is prob the relay switch.Any ideas where it's located and where i can find a manual showing location??? thanks
#2 of 144
Re: Heater blower relay switch [perplexed3] by toolhed1
Jan 22, 2007 (5:58 pm)
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Replying to: perplexed3 (Jan 22, 2007 6:37 am)

The blower resistor/relay is located at the front of the blower unit which is on the passenger side by the firewall. It is a very awkward spot. Have you checked the 20 and 10 amp heater control fuses by the glove box to determine if you are getting power there? These are what actually controls speeds 1-4 and are fed from the ignition circuit. If you are having a problem with the daytime running lights also you might want to check out the earlier posts from late december where it details that most likely the ignition switch is causing the problem.
#3 of 144
95 Grand Prix -wierd heater fan problem by edpo
Jan 26, 2007 (12:39 pm)
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I have a really strange problem. I turn my heater fan on high(although fan speed doesn't really matter) When I am idling in park...no problem. I start to drive and accelerate, the air flow thru my vents stops (although I can still hear the fan is on high)But if I ease off on the gas pedal....air flow comes back again. Step on the gas...no air flow....ease off air flow comes back. It's the strangest thing. I hope someone has an idea.
#4 of 144
Re: Heater blower relay switch [toolhed1] by christy10
Feb 09, 2007 (8:21 pm)
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Replying to: toolhed1 (Jan 22, 2007 5:58 pm)

hello, i have dont everything blower motor, fuses resistor. i still have only 5 speed lights go off 1-4. need help its cold here with heater not working right..
#5 of 144
Re: Heater blower relay switch [christy10] by toolhed1
Feb 10, 2007 (12:09 pm)
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Replying to: christy10 (Feb 09, 2007 8:21 pm)

Check the fuses next to the glove box that are for the blower and heat control unit. If there is no power there then you have a problem in the ignition switch and will need to replace it. I just did this on my car and it fixed the problem with the Blower not working on speeds 1-4 and the DRL going off when the heat was turned on. A word of caution if you do replace the ignition switch yourself, when you disconnect the battery make sure you have the security code for your radio or you'll lock it out and will need to go to the dealer to reset it.
#7 of 144
Blower fan problem by daved2
Feb 10, 2007 (1:11 pm)
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My 2001 Grand Prix's blower does not run on any of the 0-5 settings when I leave my 50 deg garage. It has been 0 to 5 degree ambient in the morning. After 10 min all switch settings work although setting 5 does not seem to be full power, but it's close. Leaving work (15 deg ambient) it comes on immediately and all the switch settings work. If I shut the car off it will not come on for 3-5 minutes. When the blower is running, it seems to decrease speed when I turn or slow down. This has been going on for a week.
#8 of 144
Re: Blower fan problem [daved2] UPDATE by daved2
Feb 12, 2007 (6:40 pm)
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Replying to: daved2 (Feb 10, 2007 1:11 pm)

I took the car to the dealer and they found water had leaked throught the cowling under the windshield onto the fan motor and the resistor board. The fan and board both had to be replaced & the leak was resealed.
#9 of 144
Re: Blower fan problem [daved2] UPDATE [daved2] by christy10
Feb 12, 2007 (8:51 pm)
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Replying to: daved2 (Feb 12, 2007 6:40 pm)

i had all the same problems you have had.
1. blower fan
2.resistor
3.heating control assy.
now i still have problems with only speed 5 after putting all that in. you would never guess what it is now.
 
the ignition switch, not key put, the wiring part in the steering colume. that runing me 100.00 tommrow i will be putting that in. so to say i had all the same problem but after doing 1 thur 3 i had found that ignition switch is the problem when only 1-4 dont work and running lights go off. so keep eye on that because this sucks. i have been fixing cars myself for about 5 years. some isnt easy but trying to track the problem. i would have never guess ignition switch, that is what starts the heat in the first place. have a great time... christy
#10 of 144
Re: Heater blower relay switch [perplexed3] by mikeisworking
Feb 15, 2007 (1:26 pm)
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Replying to: perplexed3 (Jan 22, 2007 6:37 am)

the blower and resister are behind the glove box. I just replaced both and had the whole thing apart. You actually don't need to take the glove box out to replace either. Just stick your head under the passenger side dash and you will see the blower. IMPORTANT NOTE: your motor and resister are probably bad because of a water leak. Check the water leak thread for help on that. I'm in the process of fixing that myself. Water Leak read #16.

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