Operation CHARM
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GMC Truck
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2000
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C 2500 Truck 2WD V8-5.7L VIN R
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Repair and Diagnosis
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Heating and Air Conditioning
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Air Door
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Description and Operation
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Air Distribution System
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Mode Valves
Mode Valves
The heater system provides a choice of three basic operating modes:
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VENT
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HEATER
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DEFROST