GM Service Manual Online
For 1990-2009 cars only

    Object Number: 1827943  Size: SH
  1. Remove the heater inlet/outlet pipe assembly bolts.

  2. Object Number: 1827945  Size: SH
  3. Remove the heater inlet/outlet pipe assembly.

  4. Object Number: 1412151  Size: SH
  5. Remove and discard the heater inlet/outlet pipe gasket and O-ring.

  6. Object Number: 1827947  Size: SH
  7. Remove the coolant pipe bolt.

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

  10. Object Number: 1827949  Size: SH
  11. Remove and discard the coolant pipe O-ring.

  12. Object Number: 1827950  Size: SH
  13. Remove the thermostat housing bolts.

  14. Object Number: 1827951  Size: SH
  15. Remove the thermostat housing.

  16. Object Number: 1412155  Size: SH
  17. Remove and discard the thermostat housing gasket.