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 MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHVAC SYSTEM - MANUAL
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
HVAC System - Manual
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION HVAC System - Manual
- Specifications
- Schematic and Routing Diagrams
- Diagnostic Information and Procedures
- Diagnostic Code Index
- DTC B0440, B0441, or B0442
- DTC B0445, B0446, or B0447
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
- DTC B0449, B0450, B0451, or B0452
- DTC B0455 or B0457
- DTC B0460 or B0462
- DTC B0465, B0467, or B0478
- DTC B0481, B0482, or B0483
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
- Symptoms - HVAC Systems - Manual
- Air Conditioning Compressor Malfunction
- Blower Motor Malfunction
- Auxiliary Blower Motor Malfunction (RPO C36)
- Auxiliary Blower Motor Malfunction (RPO C69 w/o Rear Controls)
- Auxiliary Blower Motor Malfunction (RPO C69 with Rear Controls)
- Air Temperature Malfunction
- Auxiliary Air Temperature Malfunction
- Air Delivery Improper
- Air Delivery Improper - Auxiliary
- Vacuum Control System Diagnostic
- Repair Instructions
- Heater and Air Conditioning Control 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
- Auxiliary Heater and Air Conditioning Control Replacement - Front
- Auxiliary Heater and Air Conditioning Control Replacement - Rear
- Auxiliary HVAC Control Processor Replacement
- Auxiliary Blower Motor Switch Replacement
- Temperature Valve Actuator Replacement - Auxiliary
- Mode Valve 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
RENDER: 1.0x
NO RELATED
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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.