Operation CHARM
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GMC Truck
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1991
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K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI
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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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Testing and Inspection
Symptom Related Diagnostic Procedures
With A/C
Display Does Not Dim Properly
None of the Air Valves Operate Correctly
Without A/C
Component Tests and General Diagnostics
A/C Clutch Relay Circuit
High Speed Fan Circuit
Low Refrigerant Detection
Low Speed Fan Circuit
Medium Speed Fan Circuit
Mode Door Actuator Drive Circuit
Mode Door Feedback Circuit
Power & Ground Circuits
Temperature Door Actuator Drive Circuit
Temperature Door Feedback Circuit
Locations
A/C Controller
Auxiliary Heater & A/C Control
Rear
Front
Heater & A/C Control
Service and Repair
Technical Service Bulletins
