For 1990-2009 cars

Notice: Do not immerse the water pump in solvent. The solvent may enter the water pump's permanently lubricated bearings and cause premature bearing failure.

1. Rotate the water pump. The water pump should turn straight and smoothly. If the hub wobbles, is noisy or feels "lumpy" when turned, replace the water pump.
2. Examine the water pump shaft on the pulley side of the pump. If coolant leakage is evident, replace the water pump.