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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 505 (HVAC SYSTEM - MANUAL)
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Section 505 (HVAC System - Manual)
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Section 505 (HVAC System - Manual)
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic and Routing Diagrams
- Diagnostic Information and Procedures
- Diagnostic Code Index
- DTC B0440, B0441, or B0442
- 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 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
- 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 B0455 or B0457
- 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 B0460 or B0462
- 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 B0465, B0467, or B0478
- 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 B0481, B0482, or B0483
- DTC P0532 or P0533
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
- DTC P0645, P0646, or P0647
- Diagnostic Instructions
- DTC Descriptor
- 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
- Component Testing
- Repair Procedures
- Symptoms - HVAC Systems - Manual
- Air Conditioning Compressor Malfunction
- Blower Motor Malfunction
- Auxiliary Blower Motor Malfunction (RPO C69 with Rear Controls)
- Auxiliary Blower Motor Malfunction (RPO C36)
- Auxiliary Blower Motor Malfunction (RPO C69 w/o 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
- Temperature Valve Actuator Replacement
- Defroster Valve 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
- Auxiliary Temperature Valve Actuator Replacement
- Auxiliary Mode Valve Actuator Replacement
- Description and Operation
- Air Delivery Description and Operation
- Air Temperature Description and Operation
- Notes
- HVAC Control Components
- HVAC Control Assembly
- Notes
- 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
- HVAC Control Assembly
- Coolant Heater (K08)
- A/C Cycle
- A/C Cycle with Auxiliary
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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.