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FIXED: Blower Motor won't shut off
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Conundrum
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PostPosted: Sun May 04, 2008 6:28 pm    Post subject: Idea FIXED: Blower Motor won't shut off Reply with quote

Hi All,

today the weirdest thing happened, my Blower Motor won't shut off, I got in to my car, turned on the AC, and drove around for a few minutes, when I got to my destination, and turned the car off, the Blower Motor stayed on even with the keys out of the ignition, the car kept blowing air in to the cabin. The only way to fix it was to remove the Blower Motor fuse under the hood, when I turn the AC on, i only have 2 settings now Full cold, and Off, but still air blowing. I saw a post in this forum about the Blower Resistor going, could this be causing my problems? and if so, are there instructions on how to replace it.

The car is a 2004 Impala,

Any help would be greatly appreciated,
Thanks



UPDATE, Also posted in new post in this thread

Quote:
Just wanted to give an update to everyone, just in case anyone runs in to this in the future.

I ended up going to a wrecker, and pulling the blower control module from a scraped 2004 impala, plugged it in to my car, and it fixed the issue with the blower motor not shutting off.


Thanks again everyone for your help.

Conundrum


Last edited by Conundrum on Tue May 20, 2008 9:57 am; edited 1 time in total
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Sabrewings
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PostPosted: Sun May 04, 2008 9:46 pm    Post subject:   Reply with quote

04+ don't use blower motor resistors anymore. It's now electronically controlled and a processor controls the blower motor. This is the first I've heard of an 04+ having this type of problem.

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Conundrum
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PostPosted: Sun May 04, 2008 11:00 pm    Post subject:   Reply with quote

Great, yea just went down and looked at it again, still doing it, blower just won't shut off.
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Conundrum
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PostPosted: Mon May 05, 2008 5:15 pm    Post subject:   Reply with quote

Anyone got any ideas?

If not I guess I'm gonna have to take it to the dealership, or a mechanic and get it looked at.
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ZSPOT
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PostPosted: Mon May 05, 2008 5:35 pm    Post subject:   Reply with quote

In 2004, there is a module that controls the blower motor that works like the old resistor style. Its even in the same place. It's not cheap, but it's worth a look anyway. I've sold about five in the last year to various W-body's if that means anything.

part number = 15850268

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Conundrum
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PostPosted: Tue May 06, 2008 10:16 am    Post subject:   Reply with quote

ZSPOT wrote:
In 2004, there is a module that controls the blower motor that works like the old resistor style. Its even in the same place. It's not cheap, but it's worth a look anyway. I've sold about five in the last year to various W-body's if that means anything.

part number = 15850268


When the module goes, can it cause the problem that I am experiencing, I have been looking online, and the two things people say it could be is that module or the ignition switch.

I took it to a Chevy dealership, they said they would have to rip the blower motor assy out, and was looking at around 600+ depending on whats wrong, with all the labor required
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PostPosted: Tue May 06, 2008 10:23 am    Post subject:   Reply with quote

If you have the car back,.. just try unplugging the module and see if the blower motor still runs. If it shuts off, thats a good indication its that.

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PostPosted: Tue May 06, 2008 10:25 am    Post subject:   Reply with quote

I believe that module is the processor I was referring to. Never heard of it going bad on a 04+ so it's hard to diagnose.

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PostPosted: Tue May 06, 2008 5:12 pm    Post subject:   Reply with quote

Ok,

so when I unpluged the module, the Blower stayed off...
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PostPosted: Tue May 06, 2008 5:29 pm    Post subject:   Reply with quote

Conundrum wrote:
Ok,

so when I unpluged the module, the Blower stayed off...


That means absolutely nothing. Wouldn't you think that would happen to any fan when you disconnect the module that controls it?

The ignition module is a possibility, but I suspect that you'd have more things than just the blower staying on.

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PostPosted: Tue May 06, 2008 6:01 pm    Post subject:   Reply with quote

I think it's a safe bet that it's the control module. It's either that or the knob itself.

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PostPosted: Tue May 06, 2008 7:44 pm    Post subject:   Reply with quote

Before condemning the module, be sure to check the inputs.

Every electronic "module" has inputs and outputs. You know that the output of the blower motor is working. Now, more information is required.

Does the blower motor work normally when the key is on and engine running?
Does the blower motor work normally when the key is out of the ignition? (only on one speed? Works on all speeds?)

There is a VERY good possibility that the probem lies with the HVAC control unit, after studying the wiring diagram. It sends a signal via one wire to the blower motor processer, and the processer has a constant power and ground.

Ryan

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PostPosted: Tue May 06, 2008 8:54 pm    Post subject:   Reply with quote

Ryan wrote:

Does the blower motor work normally when the key is on and engine running?
Does the blower motor work normally when the key is out of the ignition? (only on one speed? Works on all speeds?)

Ryan


When the key is on and the engine is running the blower is on full blast
When the key is out of the ignition and the engine is off, the blower is on full blast

I can still turn the HVAC head unit on and off, along with controlling the temperature, I just can't control the speed of the blower, or turn it off. when the car is turned off, the HVAC head unit turns off, but the blower stays on.
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PostPosted: Tue May 06, 2008 8:55 pm    Post subject:   Reply with quote

whitelightnin04MC wrote:

The ignition module is a possibility, but I suspect that you'd have more things than just the blower staying on.


what else is controlled by the ignition module? as the Blower is the only thing staying on after the car is turned off.
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PostPosted: Thu May 08, 2008 3:43 pm    Post subject:   Reply with quote

Anyone know what is effected if your ignition module starts going?
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