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My parents have an 05 yukon and it has the front and rear AC. well the front will not blow any air but every now and again it will work. So being it works sometimes i would think the Blower motor is good. I was told to check the blower motor resistor, but I'm not sure what I would be looking for. Or could it be the control panel itself? any help is appreciated
 

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Gus' dad.
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The blower motor resistor will be in the air duct, near the blower motor. Follow the wires from the blower motor and they should lead you to the blower motor resistor. Do a search on youtube, they have a video for everything.

Guardrail
 
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