The purpose for changing the resistor is because the rear fan is constantly blowing, even if everything in the AC is off. It goes from one speed to another by itself with the AC off. With the engine turned off, it continues to blow, and of course it kills the battery. I have to disconnect the battery in order to be able to use the car the next time. My Envoy is the one with the third seat row.
Doesn't have a resistor. It has a blower motor control processor. When they go bad, the blower motor defaults to always on (go figure that logic). Pull the AUX blower motor fuse until you can get a replacement. The processor is located back by the rear blower motor.
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SOURCE: digital ac controls don't respond and fan stays on whencar is off
The way to fix this is by changing the blower motor resistor.
I paid $138.00 at the dealership for a new one and it solved the problem.
SOURCE: AC blows hot air
try this website fix & troubleshoot heating & A/C www.automedia.com and another car A/C repair www.directgardening.com
SOURCE: I have 2003 gmc envoy my front ac control does not
Need to check to see if the blower motor is running.If it is,but not threw the vents,most likely a vent door actuator motor.The actuator motor in this case would be bad,it is hard to get to,unless you are mechanically inclined,You can do it your self.If the blower motor is bad,just replace it.Check fuses first,and the blower relay.If I can help,let me know.
SOURCE: The ac fan on my 2003 GMC Envoy stopped blowing.
A defective fan, relay, coolant temperature sensor, corrosion on wiring, defective ECU or wiring.
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