GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 Yukon XL - 2WD 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Heater Core Replacement

Removal Procedure
  1. Remove the heater/vent module. Refer to Heater/Vent Module Replacement .
  2. Remove the heater core cover screws.

    3. Object Number: 363771 Size: SH
  3. Remove the heater core cover.

    4. Object Number: 363772 Size: SH
  4. Remove the heater core.

Installation Procedure

    Object Number: 363772 Size: SH
  1. Install the heater core.

    2. Object Number: 363771 Size: SH
  2. Install the heater core cover.

    3. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install heater core cover screws.

    4. Tighten
    Tighten the screws to 1.6 N·m (14 lb in).

  4. Install the heater/vent module. Refer to Heater/Vent Module Replacement .