GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 38185 Hose Clamp Pliers

Removal Procedure

  1. Partially drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  3. Remove the heater coolant heater muffler. Refer to Heater Coolant Heater Exhaust Muffler Replacement .
  4. Disconnect the heater coolant heater electrical connectors.
  5. Disconnect the fuel supply hose to the heater coolant heater. Refer to Plastic Collar Quick Connect Fitting Service .

  6. Object Number: 1654279  Size: SH
  7. Reposition the heater hose clamps at the heater coolant heater using J 38185 .
  8. Remove the heater hoses from the heater coolant heater.

  9. Object Number: 1658085  Size: SH
  10. Remove the air supply hose from the heater coolant heater.

  11. Object Number: 1658078  Size: SH
  12. Remove the heater coolant heater retaining bolt.

  13. Object Number: 1658080  Size: SH
  14. Remove the heater coolant heater from the bracket.

Installation Procedure


    Object Number: 1658080  Size: SH
  1. Install the heater coolant heater to the bracket.
  2. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1658078  Size: SH
  3. Install the heater coolant heater retaining bolt.
  4. Tighten
    Tighten the bolt to 6 N·m (53 lb in).


    Object Number: 1658085  Size: SH
  5. Install the air supply hose to the heater coolant heater.

  6. Object Number: 1654279  Size: SH
  7. Install the heater hoses to the heater coolant heater.
  8. Reposition the heater hose clamps at the heater coolant heater using J 38185 .
  9. Connect the fuel supply hose to the heater coolant heater. Refer to Plastic Collar Quick Connect Fitting Service .
  10. Connect the heater coolant heater electrical connectors.
  11. Install the heater coolant heater muffler. Refer to Heater Coolant Heater Exhaust Muffler Replacement .
  12. Lower the vehicle.
  13. Fill the cooling system. Refer to Cooling System Draining and Filling .