GM Service Manual Online
For 1990-2009 cars only

Heater Case Replacement C60

Tools Required

    • J 38185 Hose Clamp Pliers
    • J 39400-A Halogen Leak Detector

Removal Procedure

  1. Drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  2. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .

  3. Object Number: 301609  Size: SH
  4. Using the J 38185 reposition the heater hose clamps from the heater core.
  5. Remove the heater hoses from the heater core.
  6. Remove the evaporator case from the vehicle. Refer to Air Conditioning Evaporator Core Replacement .

  7. Object Number: 301689  Size: SH
  8. Remove the heater case retaining nuts (2) from the engine compartment.
  9. Roll out the instrument panel. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gages and Console.
  10. Disconnect the electrical connectors.
  11. Disconnect the vacuum lines.
  12. Remove the heater case (5) from the vehicle.

Installation Procedure


    Object Number: 301689  Size: SH
  1. Install the heater case (5) to the vehicle.
  2. Connect the vacuum lines.
  3. Connect the electrical connectors.
  4. Roll the instrument panel upward. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gages and Console.
  5. 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.

  6. Install the heater case retaining nuts (2) to the engine compartment.
  7. Tighten
    Tighten the nuts to 6 N·m (53 lb in).

  8. Install the evaporator casing to the vehicle. Refer to Air Conditioning Evaporator Core Replacement .

  9. Object Number: 301609  Size: SH
  10. Connect the heater hoses to the heater core.
  11. Using the J 38185 reposition the heater hose clamps to the heater core.
  12. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  13. Leak test the fittings of the component using the J 39400-A .
  14. Fill the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.