GM Service Manual Online
For 1990-2009 cars only

Heater and Air Conditioning Control Replacement C100/Long Body

Removal Procedure

    Warning: Refer to Battery Disconnect Warning in the Preface section.


    Object Number: 1785834  Size: SH

    Note: The left-hand drive is shown. The right-hand drive is similar.

  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection.
  2. Remove the instrument panel accessory bezel. Refer to Instrument Panel Accessory Bezel Replacement.
  3. Remove the control assembly retaining screws.
  4. Pull out the unit to gain access to the rear.
  5. Disconnect the electrical connectors.
  6. Remove the air inlet tube.
  7. Remove the automatic temperature control assembly.

Installation Procedure


    Object Number: 1785834  Size: SH
  1. Connect the air inlet tube.
  2. Connect the electrical connectors.
  3. Caution: Refer to Fastener Caution in the Preface section.

  4. Position the automatic temperature control assembly and install the retaining screws tighten to 2.5 N·m (22 lb in).
  5. Install the instrument panel accessory bezel. Refer to Instrument Panel Accessory Bezel Replacement.
  6. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection.

Heater and Air Conditioning Control Replacement C105/Short Body

Removal Procedure

    Warning: Refer to Battery Disconnect Warning in the Preface section.


    Object Number: 1836928  Size: SH

    Note: The left-hand drive is shown. The right-hand drive is similar.

  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection.
  2. Remove the instrument panel accessory bezel. Refer to Instrument Panel Accessory Bezel Replacement.
  3. Remove the control assembly retaining screws.
  4. Pull out the unit to gain access to the rear.
  5. Disconnect the electrical connectors.
  6. Remove the air inlet tube.
  7. Remove the automatic temperature control assembly.

Installation Procedure


    Object Number: 1836928  Size: SH
  1. Connect the air inlet tube.
  2. Connect the electrical connectors.
  3. Caution: Refer to Fastener Caution in the Preface section.

  4. Position the automatic temperature control assembly and install the retaining screws tighten to 2.5 N·m (22 lb in).
  5. Install the instrument panel accessory bezel. Refer to Instrument Panel Accessory Bezel Replacement.
  6. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection.