blower motor problem????
Thread Starter
4th Gear
Joined: Mar 2008
Posts: 4
Likes: 0
blower motor problem????
Wondering if anyone has had similar problem with blower motor?
I have a 97 c5. One day my battery was dead when I went
out to leave. After charging the battery I found that my
blower motor runs all the time, yes without the key in
the ignition. I currently have to disconnect the battery
or it runs forever. If I start the car the blower is
also on. If I turn on the ac/heat the blower speed
will go down to the speed that I set it at but as soon
as I turn it off the blower goes back to full blast.Thinking I have a short but not sure where to start?
Any help would be very appreciated!
Thanks Jeff
I have a 97 c5. One day my battery was dead when I went
out to leave. After charging the battery I found that my
blower motor runs all the time, yes without the key in
the ignition. I currently have to disconnect the battery
or it runs forever. If I start the car the blower is
also on. If I turn on the ac/heat the blower speed
will go down to the speed that I set it at but as soon
as I turn it off the blower goes back to full blast.Thinking I have a short but not sure where to start?
Any help would be very appreciated!
Thanks Jeff
Instructor
Joined: Mar 2007
Posts: 235
Likes: 0
From: USA
Id buy a new motor control relay, or the blower motor itself. If you have a volt meter you can test where the short itself is? just buy disconecting circuits? If not sure how to do that I suggest just swapping stuff out before taking it in... You could get lucky but those two things might be your culprit.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Your blower motor is fine!
I will try to send you some schematics to help you fix the issue. Before you spend precious cash, hang in there and let me make some recommendations.
PM me your e mail address so I can send you the schematics.
BC
I will try to send you some schematics to help you fix the issue. Before you spend precious cash, hang in there and let me make some recommendations.PM me your e mail address so I can send you the schematics.
BC
Race Director
Joined: Dec 2002
Posts: 10,233
Likes: 21
From: Baltimore suburbs Maryland
Something could be grounding out the blower motor. There's a warning somewhere (I forgot if it was here or in the FSM) that when changing the blower motor, disconnect the battery. If the case of the blower motor becomes grounded, it will run. Sounds like this is what is happening to you.
Tech Contributor
Joined: Jan 2007
Posts: 19,476
Likes: 1,171
From: Dyer, IN
Something could be grounding out the blower motor. There's a warning somewhere (I forgot if it was here or in the FSM) that when changing the blower motor, disconnect the battery. If the case of the blower motor becomes grounded, it will run. Sounds like this is what is happening to you.
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Le Mans Master
Joined: Feb 2002
Posts: 6,937
Likes: 21
From: Waldorf MD
There was a "kit" that was suppose to stop mold from forming in the HVAC. It caused the fan to run for a time (think like 10 minutes) after ignition was off. The circuit would not allow fan to run if battery voltage was too low. There is a TSB out on this.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Lucky
Its true! If you ground your HVAC fan motor case to chassis ground, it will spin at HIGH SPEED! If your removing it and dont know this, YOUR IN FOR A SURPRISE!
BC
Its true! If you ground your HVAC fan motor case to chassis ground, it will spin at HIGH SPEED! If your removing it and dont know this, YOUR IN FOR A SURPRISE!
BC
Tech Contributor
Joined: Jan 2007
Posts: 19,476
Likes: 1,171
From: Dyer, IN
Man was I wrong. I took a quick look at the wiring diagram last time, and it's the control module that's grounded, not the motor case specifically. Further, I referenced the service manual for replacement of the blower motor, and there is a nice warning in red letters about disconnecting the plug, and the not to let the case contact ground because the motor will start. Kinda strange, don't ya think? Typically, an electrical device that has an outer housing that is hot all the time, is a bad thing.
Cruising
Joined: Dec 2007
Posts: 12
Likes: 0
From: Gowrie IA
My car (97, auto climate control) just developed this same problem. I've looked at the motor from below and can't see anything that would be grounding it from there, and I don't really feel like tearing into my dash any further on a wild goose chase. I found another post suggesting the BCM could be wet, and I checked that too and nothing. Any help would be appreciated. Thanks
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
My car (97, auto climate control) just developed this same problem. I've looked at the motor from below and can't see anything that would be grounding it from there, and I don't really feel like tearing into my dash any further on a wild goose chase. I found another post suggesting the BCM could be wet, and I checked that too and nothing. Any help would be appreciated. Thanks
Ted
This post is so disperse,,,what s your exact ssue??????????????
We will be glad to help you fix it. Post the isses.
BC
Cruising
Joined: Dec 2007
Posts: 12
Likes: 0
From: Gowrie IA
I'm having the same issue as the original poster, after re-reading what I posted I guess it wasn't very clear.
The blower motor wants to run on high when the car is off, or the AC is off. It operates normally when I turn the AC on.
After I found this thread, and a couple others, I figured I must have this grounding problem, but I can't find anything that would be grounding the case looking at the blower motor with just the hush panel removed.
The blower motor wants to run on high when the car is off, or the AC is off. It operates normally when I turn the AC on.
After I found this thread, and a couple others, I figured I must have this grounding problem, but I can't find anything that would be grounding the case looking at the blower motor with just the hush panel removed.