GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 38185 Hose Clamp Pliers

Removal Procedure

  1. Drain the cooling system. Refer to Cooling System Draining and Filling .

  2. Object Number: 1207743  Size: SH
  3. Raise and support the vehicle only high enough to access the thermostat housing (4) through the wheelhouse. Refer to Lifting and Jacking the Vehicle in General Information.
  4. Remove the left wheelhouse liner. Refer to Front Wheelhouse Liner Replacement in Body Front End.
  5. Position the J 38185 to the clamp (3) in order to remove the radiator inlet hose (2) from the thermostat housing (4).

  6. Object Number: 858164  Size: SH
  7. Remove the thermostat housing bolts.
  8. Remove the thermostat housing from the engine block.
  9. Clean and inspect the thermostat housing.
  10. Clean and inspect the sealing surface of the engine block.

Installation Procedure


    Object Number: 858164  Size: SH
  1. Position the thermostat housing to the engine block.
  2. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the thermostat housing bolts.
  4. Tighten
    Tighten the thermostat housing bolts to 10 N·m (89 lb in).


    Object Number: 1207743  Size: SH
  5. Position the J 38185 to the clamp (3) in order to connect the radiator inlet hose (2) to the thermostat housing (4).
  6. Install the left wheelhouse liner. Refer to Front Wheelhouse Liner Replacement in Body Front End.
  7. Lower the vehicle.
  8. Fill the cooling system. Refer to Cooling System Draining and Filling .
  9. Inspect all sealing surfaces for leaks after starting the engine.