How do you change the water pump in a 1998 subaru legacy outback?

To change the water pump in a 1998 Subaru Legacy Outback, start by disconnecting the negative battery terminal and draining the coolant. Remove the timing belt covers, then loosen and remove the timing belt by marking the belt's position for reinstallation. Next, unbolt the water pump from the engine block, clean the mounting surface, and install the new pump with a new gasket. Finally, reassemble everything in reverse order, refill the coolant, and check for leaks.