Operation CHARM
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GMC Truck
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1999
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C 2500 Truck 2WD V8-6.0L VIN U
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Repair and Diagnosis
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Heating and Air Conditioning
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Control Assembly
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Description and Operation
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HVAC System - Manual
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Mode Controls
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Recirculate Air Button
Recirculate Air Button
When the recirculate air button is pressed, air from inside the vehicle mixes with a small amount of outside air. The air discharges from the air conditioner, heater and defroster outlets.