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Inspection Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect the exterior of the water pump for the following:
    • Damage to the water pump hub bolt threads (1) for the water pump pulley
    • Excessive side-to-side play in the pulley shaft (2). If the shaft end play exceeds 0.381 mm (0.015 in), replace the water pump.
    • Leakage at the water pump weep hole (3). A stain around the weep hole is acceptable. If leakage occurs (dripping) with the engine running and the cooling system pressurized, replace the water pump.
  2. Inspect the interior of the water pump for the following:
    • Damage to the water pump gasket sealing surface (1)
    • Damage, corrosion or restrictions to the engine coolant passages (2)
    • Excessive side-to-side play in the pulley shaft (3). If the shaft end play exceeds 0.381 mm (0.015 in), replace the water pump.
    • Damage to the water pump bolt holes (4)
    • Damage, corrosion or restrictions to the water pump impeller (5)
    3. Fig 1: Checking Water Pump
    G01815299Courtesy of GENERAL MOTORS CORP.
  3. Rotate the pump shaft by hand and inspect for roughness of operation.
    • If the hub wobbles, is noisy, or feels rough when rotated, replace the water pump.
    • The shaft and fan hub must turn straight and smoothly.
  4. Repair or replace the water pump as necessary.
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