GM Service Manual Online
For 1990-2009 cars only

Engine Coolant Thermostat Housing Replacement RPO LX9

Special Tools

J 38185 (SA9111E) Hose Clamp Pliers

Removal Procedure

Important: Use the J 38185 (SA9111E) to gently release tension on the hose clamp until the hose clamp lock feature engages allowing removal of the hose.


    Object Number: 1547163  Size: SH
  1. Remove the air cleaner intake duct. Refer to Air Cleaner Inlet Duct Replacement .
  2. Remove the throttle body assembly. Refer to Throttle Body Assembly Replacement .
  3. Drain the cooling system. Refer to Cooling System Draining and Filling .
  4. Using the J 38185 release the tension on the hose clamp at the thermostat housing and reposition the clamp.
  5. Remove the radiator inlet hose from the thermostat housing.

  6. Object Number: 1641123  Size: SH
  7. Remove the thermostat housing bolts.
  8. Remove the thermostat housing.

Installation Procedure


    Object Number: 1641123  Size: SH
  1. Position the thermostat housing.
  2. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the thermostat housing bolts.
  4. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).


    Object Number: 1547163  Size: SH
  5. Install the radiator inlet hose to the thermostat housing.
  6. Using a small flat-bladed screwdriver, release the hose clamp retention lock at the thermostat housing.
  7. Install the throttle body assembly. Refer to Throttle Body Assembly Replacement .
  8. Install the air cleaner intake duct. Refer to Air Cleaner Inlet Duct Replacement .
  9. Fill the cooling system. Refer to Cooling System Draining and Filling .

Engine Coolant Thermostat Housing Replacement RPO LZ9

Tools Required

J 38185 (SA9111E) Hose Clamp Pliers

Removal Procedure

Important: Use the J 38185 (SA9111E) to gently release tension on the hose clamp until the hose clamp lock feature engages allowing removal of the hose.


    Object Number: 1677957  Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Using the J 38185 release the tension on the hose clamp at the thermostat housing and reposition the clamp.
  3. Remove the radiator outlet hose from the thermostat housing.

  4. Object Number: 1556817  Size: SH
  5. Remove the thermostat housing bolt/stud.
  6. Remove the thermostat housing.

Installation Procedure


    Object Number: 1556817  Size: SH
  1. Position the thermostat housing.
  2. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the thermostat housing bolt/stud.
  4. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).


    Object Number: 1677957  Size: SH
  5. Install the radiator outlet hose to the thermostat housing.
  6. Using a small flat-bladed screwdriver, release the hose clamp retention lock at the thermostat housing.
  7. Fill the cooling system. Refer to Cooling System Draining and Filling .