GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 38185 Hose Clamp Pliers

Removal Procedure


    Object Number: 1663207  Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Release the quick connect.
  3. Disconnect the inlet heater hose (1) at the engine.
  4. Disconnect the outlet heater hose (2) at the engine.

  5. Object Number: 1663250  Size: SH
  6. Using the J 38185 , disengage the inlet hose clamp at the module.
  7. Using the J 38185 , disengage the outlet hose clamp at the module.

  8. Object Number: 1663252  Size: SH
  9. If equipped with rear air conditioning, disengage the inlet and outlet hose clamps from the rear auxiliary pipes using the J 38185 .
  10. Remove the inlet or outlet hose.

Installation Procedure


    Object Number: 1663252  Size: SH
  1. Install the inlet or outlet hose.
  2. If equipped with rear air conditioning, engage the inlet and outlet hose clamps at the rear auxiliary pipes.

  3. Object Number: 1663250  Size: SH
  4. Engage the outlet hose clamp at the module.
  5. Engage the inlet hose clamp at the module.

  6. Object Number: 1663207  Size: SH
  7. Connect the outlet heater hose (2) at the engine.
  8. Connect the inlet heater hose (1) at the engine.
  9. Fill the cooling system. Refer to Cooling System Draining and Filling .