Where is the water pump on a 2002 Ford Ranger 4 cylinder?

On a 2002 Ford Ranger 4-cylinder (likely a 2.3L or 2.5L), the water pump is located on the front of the engine, at the bottom of the engine block, driven by the timing belt. It's generally below and to the side of the crankshaft pulley. You'll need to access it from the front of the vehicle, likely requiring removing the serpentine belt and possibly other components to get a clear view and access for replacement.