HVAC blower Failure on 94 B'ville - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-26-2003, 11:50 AM   #1
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Default HVAC blower Failure on 94 B'ville

I have a 94 B'vile w/114,000 miles. Last night the a/c fan went out. Regardless of mode (a/c, vent, defrost, heat, etc.), the fan will not blow at any speed or any switch position. Is this likely the fan motor itself dying or is there a circuit breaker or fan relay that might be at fault and if so how could I easily diagnose to see if it'* fan motor or something else? I've checked the fue panel under left side of dash and tapped on relays under big black cover in engine compartment. I removed dash and looked at switch to see if I saw a loose wire but all looks OK.

I don't have a wiring diagram. Anything else I'm missing.

please email me with ideas at [email protected]
Engine is 3.8L V6 (non-supercharged)

Thanks,


Mike
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Old 06-26-2003, 03:02 PM   #2
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Best idea may be to take a test light and test the lead at your fan wiring harness when you have commanded it to come on.
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Old 06-26-2003, 03:16 PM   #3
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Default Re: HVAC blower Failure on 94 B'ville

Quote:
Originally Posted by mikeblue94
I have a 94 B'vile w/114,000 miles. Last night the a/c fan went out. Regardless of mode (a/c, vent, defrost, heat, etc.), the fan will not blow at any speed or any switch position. Is this likely the fan motor itself dying or is there a circuit breaker or fan relay that might be at fault and if so how could I easily diagnose to see if it'* fan motor or something else
Most likely the blower motor itself has quit. While you're tapping on things, with the ignition on, tap on the blower motor itself, under the hood. I think it'll start spinning again. Mine in the '96 Trans Sport quits like this every 18 months or so. I take it out, blast the armature clean with brake cleaner (through the cooling holes in the side of the motor), and that usually gets it going again for another 18 months...
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Old 06-26-2003, 06:21 PM   #4
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You more than likely need a Blower control Module which is located under the fuse relay center on the firewall. It'* about 60-70 bucks from GM. PN 12368389.
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