I have a 1998 GMC Sonoma that has no heat and the blower mower hums. I have changed the relay switch and the resister. Also the third brake light comes on the the heat setting is on 3.

Asked by jayjul Feb 16, 2014 at 05:51 PM about the 1998 GMC Sonoma 2 Dr SLS Sport Standard Cab LB

Question type: Maintenance & Repair

1 Answer

The blower motor is good, the relay and resister are both new. The humming comes out of the relay on speed 1,2, and 3 the only thing that occurs on speed 4 is the 3rd brake light comes on.

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