GM Service Manual Online
For 1990-2009 cars only

    Object Number: 1412155  Size: SH
  1. Install a NEW gasket onto the thermostat housing.

  2. Object Number: 1412152  Size: SH
  3. Install the thermostat housing.
  4. Notice: Refer to Fastener Notice in the Preface section.

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


    Object Number: 1412151  Size: SH
  7. Install a NEW gasket and O-ring onto the heater inlet/outlet pipe assembly.

  8. Object Number: 1412150  Size: SH
  9. Install the heater inlet/outlet pipe assembly.
  10. Install the heater inlet/outlet pipe assembly bolts.
  11. Tighten
    Tighten the heater inlet/outlet pipe assembly bolts to 10 N·m (89 lb in).

Engine Coolant Thermostat Housing Installation LY7


    Object Number: 1412155  Size: SH
  1. Install a NEW gasket onto the thermostat housing.

  2. Object Number: 1412152  Size: SH
  3. Install the thermostat housing.
  4. Caution: Refer to Fastener Caution in the Preface section.

  5. Install the thermostat housing bolts and tighten to 10 N·m (89 lb in).

  6. Object Number: 1412151  Size: SH
  7. Install a NEW gasket and O-ring onto the heater inlet/outlet pipe assembly.

  8. Object Number: 1412150  Size: SH
  9. Install the heater inlet/outlet pipe assembly.
  10. Install the heater inlet/outlet pipe assembly bolts and tighten to 10 N·m (89 lb in).

Engine Coolant Thermostat Housing Installation LCS


    Object Number: 2137827  Size: SH
  1. Install a NEW gasket (1) onto the thermostat housing.

  2. Object Number: 2137824  Size: SH
  3. Install the thermostat housing (3).
  4. Caution: Refer to Fastener Caution in the Preface section.

  5. Install the thermostat housing bolts (1, 2). Ensure to install the short bolt (1) and the long bolts (2) in the proper position and tighten the thermostat housing bolts to 10 N·m (89 lb in).