GM Service Manual Online
For 1990-2009 cars only

    Object Number: 1602762  Size: SH
  1. Clean all excess dirt and debris from the water pump housing.
  2. Inspect the water pump for the following conditions:
  3. • Gasket sealing surfaces for excessive scratches or gouging
    • Excessive side-to-side play in the pulley shaft
    • Leakage at the water pump vent hole
      A stain around the vent hole is acceptable. If leakage, dripping, occurs with the engine running and the cooling system pressurized, replace the water pump.
    • Wear or damage in the belt tracking area of the pulley (1)

    Object Number: 1602764  Size: SH
  4. Inspect the water manifold for the following conditions:
  5. • Damage to threaded bolt holes (1)
    • Restrictions within the internal passages (2, 3)
    • Gasket sealing surfaces (4) for excessive scratches or gouging