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: 1827951  Size: SH
  3. Install the thermostat housing.
  4. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1827952  Size: SH
  5. Install the thermostat housing bolts. Ensure to install the short bolts (1) and the long bolt (2) in the proper position.
  6. Tighten
    Tighten the thermostat housing bolts to 10 N·m (89 lb in).


    Object Number: 1827949  Size: SH
  7. Install a NEW O-ring onto the coolant pipe.

  8. Object Number: 1827948  Size: SH
  9. Install the coolant pipe.

  10. Object Number: 1827947  Size: SH
  11. Install the coolant pipe bolt.
  12. Tighten
    Tighten the coolant pipe bolt to 10 N·m (89 lb in).


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

  14. Object Number: 1827945  Size: SH
  15. Install the heater inlet/outlet pipe assembly.

  16. Object Number: 1827943  Size: SH
  17. Install the heater inlet/outlet pipe assembly bolts.
  18. Tighten
    Tighten the heater inlet/outlet pipe assembly bolts to 10 N·m (89 lb in).