Water Pump Operation:

A device, usually located on the front of the engine and driven by one of the accessory drive belts, that circulates the coolant by causing it to move from the lower radiator-outlet section into the engine by centrifugal action of a finned impeller on the pump shaft.
How To Instructions:
Inspect
- Check for obvious problems.
Test
- Give it an in-depth diagnosis.
Replace
- Out with the old, in with the new.