How do you replace water pump on Volvo 850 water pump?

To replace the water pump on a Volvo 850, begin by disconnecting the battery and draining the coolant. Remove the serpentine belt and any components obstructing access to the water pump, such as the timing belt or engine covers. Unbolt the water pump from the engine block, clean the mating surfaces, and install the new pump with a new gasket. Finally, reassemble everything, refill the coolant, and check for leaks.