GM Service Manual Online
For 1990-2009 cars only

    Object Number: 1408853  Size: SH
  1. Remove the old gasket from the water pump sealing surfaces. Refer to Replacing Engine Gaskets .
  2. Clean all excess dirt and debris from the water pump housing.
  3. Inspect the water pump (300) for the following conditions:
  4. • Gasket and hose sealing surfaces for excessive scratches or gouging
    • Restrictions within the internal coolant passages
    • Excessive side-to-side play in the pulley shaft
    • Leakage at the water outlet housing or rear cover gasket
    • 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