Operation CHARM
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GMC Truck
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1997
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C 2500 Suburban 2WD V8-454 7.4L VIN J SFI
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Repair and Diagnosis
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Heating and Air Conditioning
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Control Assembly
Control Assembly
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Description and Operation
Locations
Auxiliary Heater and A/C Control
Auxiliary Heater and A/C Logic Module
Auxiliary Heater Control Switch
Control Assembly, HVAC
With Air Conditioning
Primary A/C System
Auxiliary System
Front Auxiliary Control Switch
Center Auxiliary Control Switch
W/O Air Conditioning
Primary Heating System
Auxiliary Heating System
Heater and A/C Control Module
Rear Auxiliary Heater Control Switch
Service and Repair
With Air Conditioning
Primary A/C System
Control Assembly and Blower Switch
Control Assembly Lamp Bulb
Auxiliary A/C System
Front Overhead Auxiliary Control Switch
Center Overhead Auxiliary Control Switch
Without Air Conditioning
Primary Heating System
Control Assembly and Blower Switch
Control Assembly Lamp Bulb
Auxiliary Heating System
In-Dash Auxiliary Control Switch
Front Overhead Auxiliary Control Switch
Center Overhead Auxiliary Control Switch
Diagrams
Heater and A/C Control Switch
C1
C3
Rear Body Harn to Aux A/C Switch
Specifications
Technical Service Bulletins