GM Service Manual Online
For 1990-2009 cars only

    Object Number: 946082  Size: SH
  1. Remove the heater inlet/outlet pipe assembly bolts.
  2. Remove the heater inlet/outlet pipe assembly.

  3. Object Number: 1665644  Size: SH
  4. Remove and discard the heater inlet/outlet pipe assembly O-ring and gasket.

  5. Object Number: 902889  Size: SH
  6. Remove the thermostat housing assembly bolts.
  7. Remove the thermostat housing assembly.

  8. Object Number: 1665645  Size: SH
  9. Remove and discard the thermostat housing assembly O-ring and gasket.