GM Service Manual Online
For 1990-2009 cars only

Engine Coolant Thermostat Replacement RPO LX9

Removal Procedure


    Object Number: 1641124  Size: SH
  1. Remove the thermostat housing. Refer to Engine Coolant Thermostat Housing Replacement .
  2. Remove the thermostat.
  3. Remove and discard the thermostat O-ring seal.
  4. Clean and inspect the thermostat housing sealing surfaces.

Installation Procedure


    Object Number: 1641124  Size: SH
  1. Install a NEW thermostat O-ring seal.
  2. Install the thermostat.
  3. Install the thermostat housing. Refer to Engine Coolant Thermostat Housing Replacement .