GM Service Manual Online
For 1990-2009 cars only

Cleaning Procedure

  1. Clean the water outlet housing with solvent.
  2. Caution: Refer to Safety Glasses Caution in the Preface section.

  3. Dry the water outlet housing with compressed air.

Inspection Procedure


    Object Number: 1644284  Size: SH
  1. Inspect the front of the water outlet housing for the following:
  2. • Damage or restrictions to the radiator hose connection (1)
    • Damage to the water outlet housing-to-cylinder head mounting holes (2)
    • Damage to the engine coolant air bleed fitting (3)
    • Damage to the water outlet housing (4)
    • Damage or restrictions to the bypass hose connection (5)

    Object Number: 1644285  Size: SH
  3. Inspect the rear of the water outlet housing for the following:
  4. • Damage to the gasket sealing surface (1)
    • Damage, blockage or excessive corrosion to the engine coolant passages (2)
  5. Repair or replace the water outlet housing as necessary.