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Home >> Chevy Truck >> 1999 >> C 2500 Truck 2WD V8-5.3L VIN T >> Repair and Diagnosis >> Heating and Air Conditioning >> Air Door >> Description and Operation >> Heating and Ventilation >> Mode Valves Description >> General Information

General Information

The heater system provides the following 5 basic operating modes:
- Upper Mode
- Bi-Level Mode
- Lower Mode
- Defog Mode
- Defrost Mode

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