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 MANUALSGMC2020ACADIA SLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 342 (HVAC - AUTOMATIC)
2020 GMC Acadia SL
Section 342 (HVAC - Automatic)
2020 GMC Acadia SLSECTION Section 342 (HVAC - Automatic)
WARNING: This page is about a different car, the 2023 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic Wiring Diagrams
- HVAC Wiring Schematics
- Power, Ground, Serial Data and HVAC Controls
- A/C Compressor Controls
- Blower Motor and Evaporator Temperature Sensors
- Mode and Temperature Control Actuators
- Sunload Sensor, Windshield Temperature Sensor, and Auxiliary Duct Air Temperature Sensors
- Rear HVAC (C69)
- Auxiliary Heater Coolant Pump, and Electrical Auxiliary Heater (C32)
- HVAC Wiring Schematics
- Diagnostic Information and Procedures
- HVAC Component Replacement Reference
- DTC B0163 or B0183
- DTC B018A, B048C, B048F, or B1395
- DTC B0193
- DTC B0208
- DTC B0223, B022A, B0233, B023A, B0408, B0418, B0428, or B3531
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC B048D
- DTC B0519 or B3583
- DTC B1020
- DTC B2B02, B2B03, B2B0B, B2B0C, or B2B38
- DTC B3933
- DTC B393B
- 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 Instructions
- DTC P0645-P0647
- DTC P18F2
- Symptoms - HVAC Systems - Automatic
- HVAC System Malfunction (CJ2)
- HVAC System Malfunction (C69)
- Air Conditioning Compressor Malfunction
- Afterblow Configuration
- Actuator Recalibration
- Repair Instructions
- Heater and Air Conditioning User Interface Control Replacement
- Heater and Air Conditioning Remote Control Replacement
- Air Conditioning Wiring Harness Replacement
- Auxiliary Heater and Air Conditioning Control Replacement
- Air Inlet Valve Actuator Replacement
- Mode Valve Actuator Replacement (Auxiliary C69)
- Mode Valve Actuator Replacement (CJ2)
- Mode Control Cam Replacement (and Levers)
- Temperature Valve Actuator Replacement (Auxiliary C69)
- Temperature Valve Actuator Replacement - Right Side
- Temperature Valve Actuator Replacement - Left Side
- Air Conditioning Evaporator Air Temperature Sensor Replacement
- Inside Air Moisture and Windshield Temperature Sensor Replacement
- Sun Load Temperature and Headlamp Automatic Control Ambient Light Sensor Replacement
- Description and Operation
- Automatic HVAC Description and Operation
- Notes
- HVAC Control Components
- Air Speed and Blower Motor (Front)
- Air Speed and Blower Motor - Rear (C69)
- Air Delivery (Front)
- Air Delivery - Rear (CJ2)
- Air Delivery - Rear (C69)
- Heating and A/C Operation
- Automatic Operation
- Heater Coolant Pump
- Electric Auxiliary Heater (C32)
- Engine Coolant and A/C System Refrigerant
- Automatic HVAC Description and Operation
RENDER: 1.0x
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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.