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HVAC System - Automatic: Removal & Installation GMC Sierra III

Automatic HVAC System 13 illustrations ~403 words

HVAC Component Replacement Reference

Scan Tool NameComponent Code / Schematic NameService NameRepair Instruction Name
Passenger Compartment Humidity, Passenger Compartment Humidity Sensor Temperature, Windshield TemperatureB160 Windshield Temperature and Inside Moisture SensorHumidity/Windshield Temperature SensorSun Load Temperature and Headlamp Automatic Control Ambient Light Sensor Replacement
Air Recirculation DoorM46 Air Recirculation Door ActuatorAir Recirculation Door ActuatorAir Inlet Valve Actuator Replacement
Right Temperature DoorM6R Air Temperature Door Actuator - RightRight Air Temperature Door ActuatorTemperature Valve Actuator Replacement - Right Side
Left Temperature DoorM6L Air Temperature Door Actuator - LeftLeft Air Temperature Door ActuatorTemperature Valve Actuator Replacement - Left Side (CJ2)
Mode DoorM37 Mode Door ActuatorMode Door ActuatorMode Valve Actuator Replacement
Upper Left Duct Air Temperature SensorB7H Air Temperature Sensor - Duct Left UpperDuct Air Temperature Sensor- Upper LeftDuct Air Temperature Sensor Replacement - Upper Left Side
Lower Left Duct Air Temperature SensorB7D Air Temperature Sensor - Duct Left LowerDuct Air Temperature Sensor- Lower LeftFloor Air Temperature Sensor Replacement - Left Side
Upper Right Duct Air Temperature SensorB7J Air Temperature Sensor - Duct Right UpperDuct Air Temperature Sensor- Upper RightDuct Air Temperature Sensor Replacement - Upper Right Side
Lower Right Duct Air Temperature SensorB7E Air Temperature Sensor - Duct Right LowerDuct Air Temperature Sensor- Lower RightFloor Air Temperature Sensor Replacement - Right Side
A/C Evaporator Temperature SensorB39 A/C Evaporator Temperature SensorEvaporator Temperature SensorEvaporator Air Temperature Sensor Replacement
Ambient Air Temperature SensorB9 Ambient Air Temperature SensorAmbient Air Temperature SensorAmbient Air Temperature Sensor Replacement (Z88 GMC) , Ambient Air Temperature Sensor Replacement (X88 Chevrolet)
Passenger Compartment Air Temperature Sensor and Sunload SensorB10B Ambient Light/Sunload SensorInside Air Temperature, Ambient Light and Sun Load sensorSun Load Temperature and Headlamp Automatic Control Ambient Light Sensor Replacement
Blower MotorM8 Blower MotorBlower MotorBlower Assembly Replacement
A/C High Side Pressure SensorB1 A/C Refrigerant Pressure SensorA/C Refrigerant Pressure SensorAir Conditioning (A/C) Refrigerant Pressure Sensor Replacement
A/C Compressor ClutchQ2 A/C Compressor ClutchA/C Compressor ClutchAir Conditioning Clutch Assembly Replacement (LV3) , Air Conditioning Clutch Assembly Replacement (L83)
A/C Compressor Solenoid ValveQ46 A/C Compressor Solenoid ValveA/C Compressor Solenoid ValveAir Conditioning Compressor Replacement (LV3) , Air Conditioning Compressor Replacement (L83)
HVAC ControlsA26 HVAC ControlsHVAC ControlsHeater and Air Conditioning Control Replacement
Remote Heater and Air Conditioning Control ModuleK33 HVAC Control ModuleHVAC Control ModuleHeater and Air Conditioning Remote Control Replacement

HVAC Component Replacement Reference

HVAC Control Module Replacement

When replacing the HVAC control module it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC control module be sure to perform the following

Note. Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.

  1. Place the ignition switch to the OFF position.
  2. Disconnect the scan tool.
  3. Install the HVAC control module.
  4. Connect all previously disconnected components.
  5. Start the vehicle
  6. Wait 40 s for the HVAC control module to self-calibrate.
  7. Operate system and verify that no DTCs have set as current DTCs.

Actuator Replacement

Preferred Method (with Scan Tool)

When replacing an HVAC actuator it will be necessary to allow the HVAC control module to perform a calibration process. When installing an HVAC actuator be sure to perform one of the following

  1. Clear all DTCs.
  2. Place the ignition switch in the OFF position.
  3. Install the HVAC actuator.
  4. Connect all previously disconnected components.
  5. Start the vehicle.
  6. With the scan tool, initiate the HVAC Actuators re-calibration feature of the HVAC Control Module Special Functions menu.
  7. Operate system and verify that no DTCs have set as current DTCs.

Alternate Method (without Scan Tool)

  1. Clear all DTCs.
  2. Place the ignition switch to the OFF position.
  3. Install the HVAC actuator.
  4. Connect all previously disconnected components.
  5. Remove the HVAC control module fuse for a minimum of 10 s.
  6. Install the HVAC control module fuse.
  7. Start the vehicle.
  8. Wait 40 s for the HVAC control module to self-calibrate.
  9. Operate system and verify that no DTCs have set as current DTCs.

Scheme 47

Scheme 47: Heater and Air Conditioning Control Replacement
Scheme 47: Heater and Air Conditioning Control Replacement
CalloutComponent Name
Preliminary Procedure Remove the radio control assembly. Refer to Radio Control Assembly Replacement .
1Heater and Air Conditioning Control Assembly Procedure Disconnect the heater and air conditioning control assembly electrical connector.

Heater and Air Conditioning Control Replacement

Scheme 48

Scheme 48: Heater and Air Conditioning Remote Control Replacement
Scheme 48: Heater and Air Conditioning Remote Control Replacement
CalloutComponent Name
Preliminary Procedure Remove the instrument panel compartment assembly. Refer to Instrument Panel Compartment Replacement .
1Heater and Air Conditioning Remote Control Procedures Unclip the heater and air conditioning remote control retainer from the heater cover. Maneuver the heater and air conditioning remote control out and down from behind the instrument panel assembly. Disconnect the heater and air conditioning remote control electrical connectors. Perform the HVAC system control module programming and setup procedure. Refer to HVAC System Control Module Programming and Setup . Perform the actuator calibration procedure. Refer to Actuator Recalibration .

Heater and Air Conditioning Remote Control Replacement

Scheme 49

Scheme 49: Air Inlet Valve Actuator Replacement
Scheme 49: Air Inlet Valve Actuator Replacement
CalloutComponent Name
Preliminary Procedure Remove the instrument panel assembly. Refer to Instrument Panel Assembly Removal .
1Air Inlet Valve Actuator Fastener (Qty: 2) CAUTION: Refer to Fastener Caution .
2Air Inlet Valve Actuator Procedures Disconnect the air inlet valve actuator electrical connector. Perform the actuator calibration procedure. Refer to Actuator Recalibration .
CAUTION
Refer to Fastener Caution .

Air Inlet Valve Actuator Replacement

Scheme 50

Scheme 50: Mode Valve Actuator Replacement
Scheme 50: Mode Valve Actuator Replacement
CalloutComponent Name
Preliminary Procedures Remove the left side floor front air outlet duct. Refer to Floor Front Air Outlet Duct Replacement - Left Side . Remove the accessory AC and DC power control module if equipped. Refer to Accessory AC and DC Power Control Module Replacement .
1Mode Valve Actuator Fastener (Qty: 2) CAUTION: Refer to Fastener Caution .
2Mode Valve Actuator Procedures Disconnect the mode valve actuator electrical connector. Perform the actuator calibration procedure. Refer to Actuator Recalibration .
CAUTION
Refer to Fastener Caution .

Mode Valve Actuator Replacement

Scheme 51

Scheme 51: Mode Control Cam Replacement (CJ2)
Scheme 51: Mode Control Cam Replacement (CJ2)
CalloutComponent Name
Preliminary Procedure Remove the mode valve actuator. Refer to Mode Valve Actuator Replacement .
1Mode Control Cam Assembly Fastener (Qty: 3) CAUTION: Refer to Fastener Caution .
2Mode Control Cam Assembly Procedure Disconnect the mode control cam assembly levers and links.
CAUTION
Refer to Fastener Caution .

Mode Control Cam Replacement (CJ2)

Scheme 52

Scheme 52: Temperature Valve Actuator Replacement - Right Side
Scheme 52: Temperature Valve Actuator Replacement - Right Side
CalloutComponent Name
Preliminary Procedure Remove the instrument panel assembly. Refer to Instrument Panel Assembly Removal .
1Temperature Valve Actuator Fastener (Qty: 2) CAUTION: Refer to Fastener Caution .
2Temperature Valve Actuator Procedures Disconnect the temperature valve actuator electrical connector. Perform the actuator calibration procedure. Refer to Actuator Recalibration .
CAUTION
Refer to Fastener Caution .

Temperature Valve Actuator Replacement - Right Side

Scheme 53

Scheme 53: Temperature Valve Actuator Replacement - Left Side (CJ2)
Scheme 53: Temperature Valve Actuator Replacement - Left Side (CJ2)
CalloutComponent Name
Preliminary Procedure Remove the right side instrument panel insulator. Refer to Instrument Panel Insulator Replacement (RPO D07) , Instrument Panel Insulator Replacement (Without RPO D07) .
1Temperature Valve Actuator Fastener (Qty: 2) CAUTION: Refer to Fastener Caution .
2Temperature Valve Actuator - Left Side Procedures Disconnect the left temperature valve actuator electrical connector. Perform the actuator calibration procedure. Refer to Actuator Recalibration .
CAUTION
Refer to Fastener Caution .

Temperature Valve Actuator Replacement - Left Side (CJ2)

Scheme 54

Scheme 54: Duct Air Temperature Sensor Replacement - Upper Right Side
Scheme 54: Duct Air Temperature Sensor Replacement - Upper Right Side
CalloutComponent Name
Preliminary Procedure Remove the instrument panel assembly. Refer to Instrument Panel Assembly Removal .
1Duct Air Temperature Sensor - Upper Right Side Procedure Twist and pull out the right side upper duct air temperature sensor to remove. NOTE: The upper right side duct air temperature sensor kit comes with a partial harness. Refer to Splicing Copper Wire Using Splice Sleeves .
NOTE
The upper right side duct air temperature sensor kit comes with a partial harness. Refer to Splicing Copper Wire Using Splice Sleeves .

Duct Air Temperature Sensor Replacement - Upper Right Side

Scheme 55

Scheme 55: Duct Air Temperature Sensor Replacement - Upper Left Side
Scheme 55: Duct Air Temperature Sensor Replacement - Upper Left Side
CalloutComponent Name
Preliminary Procedure Remove the instrument panel assembly. Refer to Instrument Panel Assembly Removal .
1Duct Air Temperature Sensor - Upper Left Side Procedure Twist and pull out the left side upper duct air temperature sensor to remove. NOTE: The upper left side duct air temperature sensor kit comes with a partial harness. Refer to Splicing Copper Wire Using Splice Sleeves .
NOTE
The upper left side duct air temperature sensor kit comes with a partial harness. Refer to Splicing Copper Wire Using Splice Sleeves .

Duct Air Temperature Sensor Replacement - Upper Left Side

Scheme 56

Scheme 56: Floor Air Temperature Sensor Replacement - Left Side
Scheme 56: Floor Air Temperature Sensor Replacement - Left Side
CalloutComponent Name
Preliminary Procedure Remove the center floor duct. Refer to Floor Air Outlet Duct Replacement - Center .
1Floor Air Temperature Sensor - Left Side Procedures From within the left side lower heater and air conditioning evaporator and blower lower case outlet, twist and push out the left side floor duct air temperature sensor to remove. Maneuver the left side floor duct air temperature sensor out from behind the heater and air conditioning evaporator and blower lower case. NOTE: The left side floor duct air temperature sensor kit comes with a partial harness. Refer to Splicing Copper Wire Using Splice Sleeves .
NOTE
The left side floor duct air temperature sensor kit comes with a partial harness. Refer to Splicing Copper Wire Using Splice Sleeves .

Floor Air Temperature Sensor Replacement - Left Side

Scheme 57

Scheme 57: Floor Air Temperature Sensor Replacement - Right Side
Scheme 57: Floor Air Temperature Sensor Replacement - Right Side
CalloutComponent Name
Preliminary Procedure Remove the center floor duct. Refer to Floor Air Outlet Duct Replacement - Center .
1Floor Air Temperature Sensor - Right Side Procedures From within the right side lower heater and air conditioning evaporator and blower lower case outlet, twist and push out the right side floor duct air temperature sensor to remove. Maneuver the right side floor duct air temperature sensor out from behind the heater and air conditioning evaporator and blower lower case. NOTE: The right side floor duct air temperature sensor kit comes with a partial harness. Refer to Splicing Copper Wire Using Splice Sleeves .
NOTE
The right side floor duct air temperature sensor kit comes with a partial harness. Refer to Splicing Copper Wire Using Splice Sleeves .

Floor Air Temperature Sensor Replacement - Right Side

Scheme 58

Scheme 58: Evaporator Air Temperature Sensor Replacement
Scheme 58: Evaporator Air Temperature Sensor Replacement
CalloutComponent Name
Procedure Remove the instrument panel compartment assembly. Refer to Instrument Panel Compartment Replacement .
1Air Conditioning Evaporator Air Temperature Sensor NOTE: The evaporator air temperature sensor kit comes with a partial harness. Refer to Splicing Copper Wire Using Splice Sleeves .
NOTE
The evaporator air temperature sensor kit comes with a partial harness. Refer to Splicing Copper Wire Using Splice Sleeves .

Evaporator Air Temperature Sensor Replacement

Scheme 59

Scheme 59: Sun Load Temperature and Headlamp Automatic Control Ambient Light Sensor Replacement
Scheme 59: Sun Load Temperature and Headlamp Automatic Control Ambient Light Sensor Replacement
CalloutComponent Name
Preliminary Procedure Remove the instrument panel extension assembly. Refer to Instrument Panel Extension Replacement .
1Sun Load Temperature and Headlamp Automatic Control and Ambient Light Sensor Procedures Disconnect the sun load temperature and headlamp automatic control and ambient light sensor electrical connector. Turn the sun load temperature and headlamp automatic control and ambient light sensor a quarter of a turn counter clockwise to remove.

Sun Load Temperature and Headlamp Automatic Control Ambient Light Sensor Replacement

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