GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 TopKick C-Series (Conventional) C6/C7/C8 🢒 HVAC 🢒 Heating, Ventilation, and Air Conditioning 🢒 Heater Assembly Replacement

Removal Procedure
  1. Remove the evaporator and blower module assembly. Refer to Air Conditioning (A/C) Evaporator and Blower Module Assembly Replacement.

    2. Object Number: 815372 Size: SH
  2. Remove the heater assembly retaining nuts (1) from the engine compartment.
  3. Remove the I/P carrier. Refer to Instrument Panel Carrier Replacement.
  4. Disconnect the temperature actuator electrical connector.
  5. Disconnect the vacuum lines from the actuators.
  6. Remove the heater assembly.

Installation Procedure

    Object Number: 815372 Size: SH
  1. Install the heater assembly.
  2. Connect the vacuum lines to the actuators.
  3. Connect the temperature actuator electrical connector.
  4. Install the I/P carrier. Refer to Instrument Panel Carrier Replacement.

    5. Caution: Refer to Fastener Caution in the Preface section.

  5. Install the heater assembly retaining nuts (2) to the engine compartment.

    6. Tighten
    Tighten the nuts to 6 N·m (53 lb in).

  6. Install the evaporator and blower module assembly. Refer to Air Conditioning (A/C) Evaporator and Blower Module Assembly Replacement.