GM Service Manual Online
For 1990-2009 cars only

    Object Number: 74081  Size: SH
  1. Remove the water pump pulley bolts.
  2. Remove the water pump pulley.

  3. Object Number: 63204  Size: SH
  4. Remove the water pump bolts.
  5. Remove the water pump and gaskets.
  6. Discard the water pump gaskets.
  7. Notice: DO NOT use cooling system seal tabs, or similar compounds, unless otherwise instructed. The use of cooling system seal tabs, or similar compounds, may restrict coolant flow through the passages of the cooling system or the engine components. Restricted coolant flow may cause engine overheating and/or damage to the cooling system or the engine components/assembly.

  8. Inspect the water pump for the following:
  9. • Gasket sealing surfaces for excessive scratches or gouges
    • Excessive side-to-side play in the pulley shaft
    • Leakage at the water inlet housing or rear cover gasket areas.
    • Leakage at the water pump vent hole
    • A stain around the vent hole is acceptable. If leakage occurs (dripping) at the vent hole with the engine running and the cooling system pressurized, replace the pump.