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Old 04-03-2006, 06:44 PM   #1
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heater blower stays running with motor off

i have a 2005 grandprix and when i shut the car off the haeter blower motor keeps running , i have to disconnect the battery cable anybody have any ideas thx.
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Old 04-03-2006, 06:56 PM   #2
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Re: heater blower stays running with motor off

2005 with this problem? You'd figure that problem would be history with the '04 and up models. I guess not.

Anyways, you have a blower motor control module which is like the old blower motor resistor in the '97 - '03 models. There is an open or short in the matrix that controls the fan speeds which causes the blower motor hi-speed relay to stay energized even with the car off because the 12v at one side of is always present from the battery. Replace the module and you should fix your problem.



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Old 04-03-2006, 07:05 PM   #3
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Re: heater blower stays running with motor off

where is the module and is it hard to change on the 3800? thx a lot
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Old 04-03-2006, 07:11 PM   #4
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Re: heater blower stays running with motor off

Quote:
Originally Posted by skyjack06
where is the module and is it hard to change on the 3800? thx a lot
Hopefully someone with a 04 and up weighs in that has had the problem. I recall only one other '04 owner having a similar problem. But the older GPs had it next to the blower motor assembly. You have to remove the kickpanel on the passenger side of the dashboard.

Do you have any bumper to bumper warranty left?

The AC Delco part number is 15-80464. Blower Motor Control Module.



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Last edited by BNaylor; 04-04-2006 at 08:53 AM.
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Old 04-03-2006, 07:13 PM   #5
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Re: heater blower stays running with motor off

sry but no
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Old 04-03-2006, 07:54 PM   #6
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Re: heater blower stays running with motor off

Quote:
Originally Posted by skyjack06
sry but no
Sorry to hear that. Another suggestion for the interim so you don't have to disconnect the battery and have it run down is look for a fuse that may be marked HVAC HI. Should be in the instrument panel fusebox located at right side of the dash.

When pulled it should drop the battery power to that relay I mentioned but all other blower speeds should be OK.



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Old 04-04-2006, 07:58 AM   #7
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Re: heater blower stays running with motor off

The blower module is still mounted in the heater box next to the blower motor on a 2005 model. The part number has changed, the newest number is 15-80464 (gm part # 89018653), dealer retail is $66.24. We sell it for $33.12.
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Old 04-07-2006, 07:32 PM   #8
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Re: heater blower stays running with motor off

replaced module fixed problem nothing else to say but you are the man bnaylor3400 thank you
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Old 04-07-2006, 10:45 PM   #9
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Re: heater blower stays running with motor off

Quote:
Originally Posted by skyjack06
i have a 2005 grandprix and when i shut the car off the haeter blower motor keeps running , i have to disconnect the battery cable anybody have any ideas thx.
An 05 GP should still be under warranty. Why can't you bring in your car and let Pontiac dealership solve it?
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Old 04-08-2006, 12:18 AM   #10
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Re: heater blower stays running with motor off

Maybe it was an 05' model fleet car bought in 04' with a lot of miles or they did something to void warranty?
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Old 04-08-2006, 12:51 AM   #11
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Re: heater blower stays running with motor off

Quote:
Originally Posted by jessep28
Maybe it was an 05' model fleet car bought in 04' with a lot of miles or they did something to void warranty?
Thats probably the case. I asked him earlier if he had any warranty and his reply was no. I've seen 1 year old rental cars with 30K miles on the odometer. So it won't take much use to get it out of the initial bumper to bumper warranty which is 3 years or 36K miles, whichever comes first on a '05 Grand Prix.

What surprised me the most was the '04 and up GPs still having blower problems like on our '97 - '03 models. I guess some things never change. At least its resolved.



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Old 02-08-2008, 10:56 AM   #12
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Re: heater blower stays running with motor off

I have a 2005 Gran Prix GT, How do I remove the blower module and what tools do I need as it dosen't look like regular bolts holding it in.
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Old 02-08-2008, 11:04 AM   #13
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Re: heater blower stays running with motor off

Quote:
Originally Posted by guido833
I have a 2005 Gran Prix GT, How do I remove the blower module and what tools do I need as it dosen't look like regular bolts holding it in.
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