GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 571433  Size: SH
  1. Drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  2. Remove the heater hoses..
  3. Remove the heater core tube clamp bolt.
  4. Remove the heater core tube clamp.
  5. Remove the heater core shroud seal.
  6. Remove the heater rear case bolts (2).
  7. Remove the heater rear case.
  8. 7.1. Slide the heater rear case downward in order to disengage the upper case clip.
    7.2. Remove the heater rear case.
  9. Remove the instrument panel (IP) compartment door. Refer to Instrument Panel Compartment Door Replacement .
  10. Remove the heater core clamp bolt (3).
  11. Remove the heater core clamp.
  12. Remove the heater core (1).

Installation Procedure


    Object Number: 571433  Size: SH
  1. Install the heater core (1).
  2. Install the heater core clamp.
  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.

  4. Install the heater core clamp bolt (3).
  5. Tighten
    Tighten the heater core clamp bolt (3) to 1.8 N·m (16 lb in).

  6. Use the following steps in order to install the heater rear case.
  7. 4.1. Slide the heater rear case upward into position until the upper clip engages.
    4.2. Engage the snap on the left edge of the heater rear case to the distributor case.
    4.3. Install the bolts to the heater rear case.

    Tighten
    Tighten the heater rear case bolts (2) to 2.0 N·m (18 lb in).

  8. Install the heater core shroud seal.
  9. Install the heater core tube clamp.
  10. Install the heater core tube clamp bolt.
  11. Tighten
    Tighten the heater core tube clamp bolt to 2 N·m (18 lb in).

  12. Install the instrument panel (IP) compartment door. Refer to Instrument Panel Compartment Door Replacement .
  13. Install the heater hoses.