How do you know if the water pump is bad on your 2001 Subaru Outback?

A good sign of a water pump going bad is noise. It usually makes a grinding sound. Another sign is antifreeze leakage around the water pump. Some manufacturers put a small hole on the top side of the pump so that when the bearings fail coolant leaks out from this hole. Another good sign is high water temp gauge. When the water pump goes bad it fails to do its job of pumping coolant through the engine, hence the high water temp gauge. Hope this helps.