How do you install a water pump in a 1995 Volvo 850?

To install a water pump in a 1995 Volvo 850, first disconnect the battery and drain the cooling system. Remove the serpentine belt, then detach the timing belt cover and the timing belt itself to access the water pump. Unbolt the old water pump, clean the mounting surface, and install the new pump with a new gasket. Reassemble everything in reverse order, refill the cooling system, and check for leaks.