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heat blower will not turn off using the selector or with the key off or removed. This happened 2 weeks ago and it killed my battery. Recharged it and problem went away. Today it happened again. while trying to find a solution I removed the 30amp front HVAC fuse from under the hood in the electrical center. This finally shut it off. when i reinstall the fuse it starts blowing again even with the key in my pocket. what could it be???? Blower motor Relay?????
it could be the blower resistor. they resistor used to be a series of cois use to reduce the fan speed. Now it's a small module. The module can short to power and keep the blower connected to the "power all the time" battery connection.
- GMC Blower motor resistor module.
- resistor.jpg (56.43 KiB) Viewed 1738 times
I did some troubleshooting and thats what i found. If i diconect the 30amp fuse under the hood the blower will now shut off it just will not work on five or high. I guess setings 1 thru 4 are fuse in the dash board 25 amp fuse and the 5 or high setting is the 30 amp under hood. this will work for me until I have the $$ and the time to replace the resistor module. Thanx