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GMC Truck
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1999
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Savana 3/4 Ton Van V8-6.5L DSL Turbo VIN F
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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.