GM Service Manual Online
For 1990-2009 cars only

Cleaning Procedure

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

  3. Dry the water outlet housing with compressed air.

Inspection Procedure


    Object Number: 1041044  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 threads for the heater hose fitting (2)
    • Damage to the threads for the throttle body bolts (3)
    • Damage to the threads for the engine coolant air bleed fitting (4)
    • Damage to the water outlet housing-to-cylinder head mounting holes (5)
    • Damage or restrictions to the bypass hose connection (6)

    Object Number: 1041052  Size: SH
  3. Inspect the rear of the water outlet housing for the following:
  4. • Damage, blockage or excessive corrosion to the engine coolant passages (1)
    • Damage or restrictions to the EVAP purge solenoid port (2)
    • Damage to the threads for the EVAP purge solenoid bolt (3)
    • Damage to the sealing surface for the intake manifold duct (4)
    • Damage or restrictions to the MAP sensor port (5)
    • Damage to the threads for the MAP sensor bolt (6)
  5. Repair or replace the water outlet housing as necessary.