GM Service Manual Online
For 1990-2009 cars only

    Warning: Refer to Safety Glasses Warning in the Preface section.


    Object Number: 480571  Size: SH
  1. Remove the old gasket material from the water pump sealing surfaces.
  2. Clean all the dirt and any debris from the water pump.
  3. Inspect the water pump for the following:
  4. • Leakage or damage to the housing cover or gasket (1)
    • Excessive scratches or gouging to the gasket sealing surfaces (2)
    • Leakage from the water pump vent hole (3)
      A stain around the vent hole is acceptable. If leakage occurred (dripping) with the engine operating and the cooling system pressurized, then replace the water pump.
    • Damaged bolt hole threads (4)
    • Excessive side-to-side movement of the water pump shaft (5)
    • Leakage around the water inlet pipe (6)
    • Leakage around the heater hose pipe (7)
    • Restrictions within the internal coolant passages