When my heater fuse blows (twice in the last week, goa short somewhere in the A.C. wiring, but can't leave the switch alone: I'm a dummy) it kills the hi setting on the fan too. I'd go after that resister. Just my Opinion.
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'07 GMC Acadia SLT. Sweet ride.
'08 Crew Cab Z-71 short bed. Really like this truck A LOT.
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