1999 GMC Sierra Pickup Truck

Asked by Jul 27, 2014 at 03:28 PM about the 1999 GMC Sierra 1500 SLT 4WD Extended Cab LB

Question type: Maintenance & Repair

The blower fan inside my truck works only on low and medium but will not work on high??

1 Answer

78,055

High speed blower relay is the most likely problem. Also the blower motor could have high start amperage draw on high speed.

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