HEATER SELECTION CONTROL

2000 GMC C2500

Tiny

rennerdk

December, 11, 2007 AT 10:03 AM

Heater problem
2000 GMC C2500 V8 Four Wheel Drive Automatic 150000 miles

My 2000 GMC heater control knob will not change from defrost to floor or any other mode, its stuck on defrost.I know the older systems operated on vacuum this system appears to be all electrical. Where do I start?

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