Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHVAC SYSTEMS - MANUAL
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
HVAC Systems - Manual
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION HVAC Systems - Manual
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Code Index
- Scan Tool Output Controls
- Scan Tool Data List
- Scan Tool Data Definitions
- DTC B0440, B0441, or B0442
- DTC B0445, B0446, or B0447
- DTC B0449, B0450, B0451, or B0452
- DTC B0455 or B0457
- DTC B0460 or B0462
- DTC B0465, B0467, or B0478
- DTC B0481, B0482, or B0483
- DTC B0484, B0485, B0486, B0488, B048A, B1000, B1004, B1424, B1425 or B1439
- Symptoms - HVAC Systems - Manual
- HVAC Compressor Clutch Does Not Engage
- HVAC Compressor Clutch Does Not Disengage
- Blower Motor Always On
- Blower Motor Inoperative
- Blower Motor Malfunction
- Blower Motor Always On - Auxiliary (Passenger Van w/Aux)
- Blower Motor Always On - Auxiliary (Aux Heat Only or Cargo Van w/Aux)
- Blower Motor Inoperative - Auxiliary
- Blower Motor Malfunction - Auxiliary
- Too Hot in Vehicle
- Too Cold in Vehicle
- Too Hot in Vehicle - Auxiliary (Passenger Van w/Aux)
- Too Hot in Vehicle - Auxiliary (Cargo Van w/Aux)
- Too Hot in Vehicle - Auxiliary (Cargo Van w/Aux Rear Heater)
- Too Cold in Vehicle - Auxiliary (Passenger Van w/Aux)
- Too Cold in Vehicle - Auxiliary (Cargo Van w/Aux)
- Too Cold in Vehicle - Auxiliary (Cargo Van w/Aux Rear Heater)
- Air Delivery Improper
- Air Delivery Improper - Auxiliary (Passenger Van w/Aux)
- Air Delivery Improper - Auxiliary (Cargo Van w/Aux)
- Vacuum Control System Diagnostic
- Repair Instructions
- HVAC Control Assembly Replacement
- Air Temperature Actuator Replacement
- Defroster Actuator Replacement
- Mode Actuator Replacement - Upper
- Mode Actuator Replacement - Lower
- Recirculation Actuator Replacement
- Vacuum Tank Replacement
- Vacuum Pump Assembly Replacement
- HVAC Control Assembly Replacement - Front Auxiliary
- HVAC Control Assembly Replacement - Rear Auxiliary
- HVAC Control Processor Replacement - Auxiliary
- Blower Motor Switch Replacement - Auxiliary
- Air Temperature Actuator Replacement - Auxiliary
- Mode Actuator Replacement - Auxiliary
- Description and Operation
- Air Delivery Description and Operation
- Air Temperature Description and Operation
- Notes
- HVAC Control Components
- HVAC Control Assembly
- Auxiliary HVAC Control Processor
- Air Temperature Actuator
- A/C Pressure Switches
- Bypass Valves
- Heating and A/C Operation
- Heater Mode - Auxiliary Heater without A/C
- Heater Mode - Front Auxiliary HVAC Control Assembly Only
- Heater Mode - Front Auxiliary HVAC Control Assembly with Rear Auxiliary HVAC Control Assembly
- Heater Mode - Rear Auxiliary HVAC Control Assembly
- A/C Mode - Front Auxiliary HVAC Control Assembly Only
- A/C Mode - Front Auxiliary HVAC Control Assembly with Rear Auxiliary HVAC Control Assembly
- A/C Mode - Rear Auxiliary HVAC Control Assembly
- Engine Coolant
- Coolant Heater (K08)
- A/C Cycle
- A/C Cycle with Auxiliary
- Special Tools and Equipment
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.