GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Important: The engine cooling system thermostat and water pump will not function correctly if oil is present in the cooling system.

The cooling system MUST be flushed, the water pump and thermostat replaced if oil is found in the cooling system.

  1. Drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Reposition the outlet hose clamp at the water pump inlet.
  3. Remove the outlet hose from the water pump inlet.

  4. Object Number: 370076  Size: SH
  5. Remove the water pump inlet bolts.
  6. Remove the water pump inlet.
  7. The O-ring seal is integral to the thermostat housing.
  8. Remove the thermostat housing.

Installation Procedure

  1. Install the thermostat housing.
  2. Ensure the thermostat housing has an O-ring seal and is in the groove correctly.

  3. Object Number: 370076  Size: SH
  4. Install the water pump inlet (with thermostat).
  5. Notice: Refer to Fastener Notice in the Preface section.

  6. Install the water pump inlet bolts.
  7. Tighten
    Tighten the water pump inlet bolts to 15 N·m (11 lb ft).

  8. Install the outlet hose to the water pump inlet.
  9. Position the outlet hose clamp at the water outlet.
  10. Fill the cooling system. Refer to Cooling System Draining and Filling .