GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 38185 Hose Clamp Pliers

Removal Procedure


    Object Number: 1548562  Size: SH
  1. Disconnect the heater inlet and outlet hoses from the auxiliary heater inlet/outlet pipes using J 38185 .
  2. Drain the coolant system. Refer to Cooling System Draining and Filling .
  3. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
  4. Remove the auxiliary heater inlet/outlet pipe clip nut (1).

  5. Object Number: 1548564  Size: SH
  6. Remove the auxiliary heater inlet/outlet pipe clip nut (1).

  7. Object Number: 1548566  Size: SH
  8. Remove the auxiliary heater inlet/outlet pipe clip (1).

  9. Object Number: 1548568  Size: SH
  10. Remove the auxiliary heater inlet/outlet pipe (2) clip nut (1).

  11. Object Number: 1548572  Size: SH
  12. Remove the auxiliary heater inlet/outlet pipe clip (1).

  13. Object Number: 1548575  Size: SH
  14. Remove the auxiliary inlet/outlet pipe (2) clip nut (1).

  15. Object Number: 1548579  Size: SH
  16. Using the J 38185 , disconnect the auxiliary heater inlet/outlet hoses (2) at the rear of the vehicle.
  17. Remove the auxiliary heater inlet/outlet hose assembly.

Installation Procedure


    Object Number: 1548579  Size: SH
  1. Install the auxiliary heater inlet/outlet hoses (2) to the rear of the vehicle.
  2. Using a small flat-bladed screwdriver, release the hose clamp retention locks.
  3. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1548575  Size: SH
  4. Install the auxiliary inlet/outlet pipe (2) clip nut (1).
  5. Tighten
    Tighten the nut to 10 N·m (89 lb in).


    Object Number: 1548572  Size: SH
  6. Install the auxiliary heater inlet/outlet pipe clip (1).

  7. Object Number: 1548568  Size: SH
  8. Install the auxiliary heater inlet/outlet pipe (2) clip nut (1).
  9. Tighten
    Tighten the nut to 10 N·m (89 lb in).


    Object Number: 1548566  Size: SH
  10. Install the auxiliary heater inlet/outlet pipe clip (1).

  11. Object Number: 1548564  Size: SH
  12. Install the auxiliary heater inlet/outlet pipe clip nut (1).
  13. Tighten
    Tighten the nut to 10 N·m (89 lb in).

  14. Lower the vehicle.

  15. Object Number: 1548562  Size: SH
  16. Install the auxiliary heater inlet/outlet pipe clip nut (1).
  17. Tighten
    Tighten the nut to 10 N·m (89 lb in).

  18. Install the heater inlet and outlet hoses to the auxiliary heater inlet/outlet pipes.
  19. Using a small flat-bladed screwdriver, release the hose clamp retention locks.
  20. Fill the coolant system. Refer to Cooling System Draining and Filling .