How to Make Your Car Last Forever: Avoid Expensive Repairs, Improve Fuel Economy, Understand Your Warranty, Save Money

The impeller is attached to a shaft that rides on bearings inside the pump.
When the bearings go bad, the shaft starts to wobble and the water pump fails.
The water pump can also fail as a result of a worn impeller or the poor
performance of a bad belt or a belt that needs adjusting.