GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2006 🢒 TopKick C-Series (Conventional) C6/C7/C8 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Mode Door Replacement - Lower

Removal Procedure
  1. Remove the heater assembly. Refer to Heater Assembly Replacement .

    2. Object Number: 691864 Size: SH
  2. Disconnect the vacuum hose from the lower mode actuator (2).
  3. Remove the lower mode actuator (2) from the heater assembly (4).
  4. Remove the linkage from the lower mode actuator (2).
  5. Remove the heater assembly cover screws.
  6. Remove the heater assembly cover.

    7. Object Number: 691852 Size: SH
  7. Remove the lower mode door (1) to the heater assembly (2).

Installation Procedure

    Object Number: 691852 Size: SH
  1. Install the lower mode door (1) to the heater assembly (2).
  2. Install the heater assembly cover.

    3. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the heater assembly retaining screws.

    4. Tighten
    Tighten screws to 1.9 N·m (17 lb in).


    Object Number: 691864 Size: SH
  4. Install the linkage to the lower mode actuator (2).
  5. Install the lower mode actuator (2) to the heater assembly.
  6. Connect the vacuum hose to the lower mode actuator (2).
  7. Install the heater assembly. Refer to Heater Assembly Replacement .