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Chevy Truck
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1999
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Express 1 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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Modes 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.