Water Pump

NOTE: It is normal for water pump to weep a small amount of coolant from weep hole (Black stain on water pump body). DO NOT replace water pump if this condition exists. Replace water pump if a heavy deposit or a steady flow of Green/Brown engine coolant is evident on water pump body from weep hole (shaft seal failure). Be sure to perform a thorough analysis before replacing water pump.

Replace water pump if it has any of the following defects:

Damage or cracks on pump body.
Coolant leaks; if seal is leaking, this will be evident by traces of thick deposits of Greenish/Brown dried glycol running down pump body and components below. A thin Black stain below pump weep hole is considered normal operation.
Impeller rubs inside of timing belt cover.
Excessively loose or rough turning bearing.