GM Service Manual Online
For 1990-2009 cars only

Engine Coolant Thermostat Housing Replacement RPO LX9

Removal Procedure


    Object Number: 1641116  Size: SH
  1. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  2. Partially drain the cooling system. Refer to Cooling System Draining and Filling .
  3. Reposition the radiator inlet hose clamp at the thermostat housing.
  4. Remove the radiator inlet hose from the thermostat housing.

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

Installation Procedure


    Object Number: 1641123  Size: SH
  1. Install 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: 1641116  Size: SH
  5. Install the radiator inlet hose to the thermostat housing.
  6. Position the radiator inlet hose clamp at the thermostat housing.
  7. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  8. Fill the cooling system. Refer to Cooling System Draining and Filling .