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Home >> GMC Truck >> 2000 >> C 3500 Truck 2WD V8-454 7.4L VIN J SFI >> Repair and Diagnosis >> Heating and Air Conditioning >> Air Door >> Description and Operation >> Air Distribution System >> Mode Valves

Mode Valves

The heater system provides a choice of three basic operating modes:
- VENT
- HEATER
- DEFROST

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