2002 GMC Envoy blower

2002 GMC ENVOY
79,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MARP
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The blower on the air conditioner only works when the knob is on 4 otherwise on 1, 2, 3 and 5 it's just like the air conditioner is off. Is there a fuse or something I can replace?
Jun 23, 2008 at 3:14 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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