GM Service Manual Online
For 1990-2009 cars only

Heater and Air Conditioning Control Replacement Control Assembly

Removal Procedure

  1. Remove the radio. Refer to Radio Replacement in Entertainment.

  2. Object Number: 835770  Size: SH
  3. Remove the center knob from the HVAC control unit
  4. Remove the screw from the control unit.
  5. Remove the center console and heater control trim panel (1).
  6. Remove the electrical connector from the HVAC control unit.

  7. Object Number: 835774  Size: SH
  8. Remove the mode control cable from the HVAC control unit.

  9. Object Number: 835778  Size: SH
  10. Remove the following from the HVAC control unit:
  11. • The temperature control cable
    • The A/C cable
  12. Remove the HVAC control unit.
  13. Remove the following from the HVAC control unit:
  14. • The mode control and temperature control knobs
    • The lamp bulbs

Installation Procedure


    Object Number: 835778  Size: SH
  1. Install the following to the HVAC control unit:
  2. • The lamp bulbs
    • The mode control and temperature control knobs
    • The electrical connector
    • The mode control cable
    • The temperature control cable
    • The A/C cable
  3. Install the HVAC control unit to the instrument panel.

  4. Object Number: 835770  Size: SH
  5. Install the center console and heater control trim panel (1). Secure the panel with the screw.
  6. Install the center knob to the HVAC control unit.
  7. Adjust the cables as necessary, refer to the following:
  8. •  Temperature Control Cable Adjustment
    •  Mode Linkage Adjustment in Heating, Ventilation and Air Conditioning
  9. Install the radio. Refer to Radio Replacement in Entertainment.

Heater and Air Conditioning Control Replacement A/C Switch

Removal Procedure


    Object Number: 835188  Size: SH
  1. Using a taped flat bladed tool, gently pry and release the retaining clips which secure the instrument panel (I/P) accessory center trim plate (1) to the instrument panel assembly.
  2. Disconnect the A/C switch electrical connector.
  3. Press down on the tabs and remove the A/C switch from the I/P center trim panel.

Installation Procedure


    Object Number: 835188  Size: SH
  1. Install the A/C switch to the I/P center trim panel.
  2. Connect the A/C switch electrical connector.
  3. Install the I/P accessory center trim plate (1) to the I/P assembly. Ensure that the retaining clips are fully engaged.