FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM
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Car repair manuals for everyone.
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Chevy Truck
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1999
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Express 1 Ton Van 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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Heating and Ventilation
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Mode Valves Description
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Vent Mode
Vent Mode
With the mode knob in the VENT position, the vent valve opens so air can flow to the instrument panel outlet ducts.