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12-04-2011, 06:17 PM | #1 |
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2004 Grand Prix blower motor???? GM Tech. help?
On the way home last night in our 2004 Grand Prix the blower motor for the a/c heater just quit. I have researched it a little on google but I'm still a little confused.
I have read where the control module or resistor will keep them from running but I removed it and have hooked up direct 12 volts from another car battery and it blows full blast. I checked the connector with a DVM and it goes from about 10v when all the way down up to about 12.5 all the way up. It looks like there is voltage to the fan so I hate to spend $60 plus for the resistor or $50 plus for the fan only to find out its something else. Any GM techs. mind helping me diagnose further before buying parts? thanks |
12-04-2011, 08:20 PM | #2 |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
may be a dumb question and i dont really know about it, but have you checked the fuses?
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12-04-2011, 09:00 PM | #3 |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
Well, since I'm getting 12 volts at the plug
I really didn't see any need to check it Posted via Mobile Device |
12-04-2011, 10:28 PM | #4 |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
If your getting voltage to the fan motor make sure it's getting a good ground....
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12-04-2011, 10:34 PM | #5 |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
I'm not sure how to check that since the housing is plastic and I think it pulls the ground from the connector? If there is a seperate ground I couldn't find it. I looked thinking the same thing.
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12-04-2011, 11:13 PM | #6 |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
. Check voltage on the Gray/Black wire at the blower control module, check for 8 volts on high blower speed and about 2 volts on low speed . If it is OK, check the B+ on the Red wire and ground. Before replacing the blower module, amp draw the blower motor. The blower motor should draw less than 15 amps running on the Black wire. If all this is good, then the blower module needs to be replaced
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12-04-2011, 11:36 PM | #7 | ||
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
Quote:
with the knob all the way down 5.38 volts as I turned it up the voltage dropped to 1.34. Does the fan need to be connected? It wasn't Quote:
I don't have an amp probe or amp meter to get the load amperage? |
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12-04-2011, 11:40 PM | #8 |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
What baffles me, If there is 12+/- volts going to the fan, why wouldn't it run? Do they work different from a standard 12 volt lamp or similar device?
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12-05-2011, 07:57 AM | #9 |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
current flow;
battery, fuse, fan motor, resistor(or module if you have auto temp control), switch, ground. if the fan is totally inop I usually find either a bad motor (tap with hammer handle to diagnose while on high) or melted connections at resistor. if fan quit on only one or 2 speeds I usually find a bad resistor
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12-05-2011, 09:33 AM | #10 | |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
Quote:
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12-05-2011, 10:43 AM | #11 |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
If you pull your resistor out you will be able to tell if it is bad.
I have replaced plenty of them. And there is always a burnt spot on the resistor.
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12-05-2011, 10:46 AM | #12 | |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
Quote:
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12-05-2011, 11:11 AM | #13 |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
in the last year or so what i have seen is on the early 2000 car/truck is the the resistor burns and when it is replaced it will normal run the year and burn out a gain. this seems due to the blower on the way out. the blower will run but is pulling slightly higher amps than the factory specks. so to fix the proper way is a resistor and blower motor at the same time. i think they have to step up and builid a better resitor. in the older cars what has been said it what i have found to work.
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12-06-2011, 10:50 PM | #14 |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
I replaced the resistor on my '02 Grand Prix and within 6 months (of kicking the heater box ), the motor stopped all together. It's all good now.
IIRC, the resistor was held in with 3 hex head screws (7mm?)
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12-07-2011, 12:34 AM | #15 | |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
Quote:
after reading this, I just ordered a new fan and resistor. Man, I would swear this thing is held in with rivets? I will check it out when I get the parts. I quit driving this car this week since the temp is in the 20s to 30s. |
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12-07-2011, 07:47 AM | #16 | |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
Quote:
you will need a swivel socket to get to the one by firewall. here's a tip, that one at front is a bit**. use a utility knife and cut away some of the firewall sound insulation
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12-07-2011, 08:27 PM | #17 |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
that looks like a blower control module. it serves the same purpose as a resistor. the HVAC computer sends a pulse width modulated signal to turn on and off a solid state switch which in turn controls blower speed.
red is ign. power, black is ground, gray is control signal, purple is blower power while the black next to it is blower ground. borrowed from hayhauler post; Check voltage on the Gray/Black wire at the blower control module, check for 8 volts on high blower speed and about 2 volts on low speed . If it is OK, check the B+ on the Red wire and ground. Before replacing the blower module, amp draw the blower motor. The blower motor should draw less than 15 amps running on the Black wire. If all this is good, then the blower module needs to be replaced when replacing module you remove the heads of rivets and install new unit with screws in the other holes visible in picture. they do it that way as it's quicker on the assembly line than using screws. I should add that this design of blower control has a shorter life span that a resistor and is a common failure item. the large transistor inside gets overheated and the molecular structure of the emitter blows in the same manner as a fuse. a new blower motor would be a good idea to prevent premature failure of new module.
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12-07-2011, 11:22 PM | #18 | |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
Quote:
I did the rest of the volt meter test results above. I have already ordered a new blower and module/resistor so when I get those parts in I'm just going to replace both. I was hoping to avoid the high price of replacing both but after reading what you fellows wrote it's just insurance that we won't have to mess with it for another 7 years.......... hopefully |
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12-08-2011, 10:14 AM | #19 |
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Re: 2004 Grand Prix blower motor???? GM Tech. help?
Here's another weird thing. I had a quick errand to run last night so I thought I'll just take the GP. Well, we got a few miles down the road and decided it was a bad idea without the blower motor installed. It just blew icy air into the cabin. I stopped at a gas station and stuck the fan back in to fill the hole. I thought well I might well stick the plug in for kicks. It fired right up? It was pretty loud right down there by it, so the fan is more than likely toast but it has been working flawless since I put it back in last night.
When I get the new fan, you guys think I should still replace the fan and controller?? |
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