How do you repair a water pump on a 2004 Audi?

To repair a water pump on a 2004 Audi, first, disconnect the battery and drain the coolant. Remove any components obstructing access to the water pump, such as the timing belt or serpentine belt, depending on the engine type. Unbolt the water pump and clean the mating surfaces before installing a new pump with a fresh gasket. Finally, reassemble everything, refill the coolant, and check for leaks.