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 1/2 Ton Van V6-4.3L VIN W
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Repair and Diagnosis
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Heating and Air Conditioning
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Description and Operation
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Heating and Ventilation
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Air Distribution System Description
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Mode Valves
Mode Valves
The heater system provides the following 3 basic operating modes:
^
VENT
^
HTR
^
DEFROST
The system also can combine the features of HTR, and DEFROST into 1 position called BLEND.