GM Service Manual Online
For 1990-2009 cars only

Engine Coolant Thermostat Replacement LA3, LY9

Removal Procedure

  1. Remove the thermostat housing. Refer to Engine Coolant Thermostat Housing Replacement .

  2. Object Number: 790876  Size: SH
  3. Complete the following in order to remove the thermostat from the thermostat housing:
  4. 2.1. Depress the ears on both sides of the thermostat.
    2.2. Rotate the thermostat until it clears the retaining feature of the housing.
    2.3. Release the pressure from the thermostat.
    2.4. Pull the thermostat from the thermostat housing.

Installation Procedure


    Object Number: 790876  Size: SH
  1. Complete the following in order to Install the thermostat into the thermostat housing:
  2. 1.1. Align the thermostat pin to the thermostat housing orifice.
    1.2. Depress the ears on both sides of the thermostat.
    1.3. Rotate the thermostat until it aligns with the retaining feature of the housing.
    1.4. Release the pressure from the thermostat.
  3. Install the thermostat housing. Refer to Engine Coolant Thermostat Housing Replacement .