How do you tell if a water pump on a subaru is pumping?

To determine if a water pump on a Subaru is functioning properly, check for coolant circulation by observing the radiator or coolant reservoir; if the coolant is moving after the engine reaches operating temperature, the pump is likely working. Additionally, listen for any unusual noises such as grinding or whining, which could indicate a problem. Inspect for any leaks around the pump area, as these can signal a failure. If in doubt, a professional mechanic can perform a more thorough diagnosis.