Operation CHARM
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GMC Truck
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2000
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K 2500 Truck 4WD 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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Modes
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Vent Mode
Vent Mode
When the mode rotary knob is in the VENT position, the defroster valve and the heater valve remain closed. As a result, the air coming from the instrument panel vents should be approximately the same temperature as the outside air.