The interior of your BMW is where you will hopefully spend most of your time, so it should be ergonomic, comfortable, and safe. All interior components, from OEM replacement switches, trim, or steering wheels, to aftermarket upgrades like racing wheels, safety equipment, and racing seats, are available at Turner Motorsport.
The auxiliary water pump helps to move coolant through the heating system. Sometimes the unit can develop leaks or the pump itself may fail. It also includes the heater valve which controls the flow of coolant through the heater core. If the heater valve becomes stuck open, you may get hot air when attempting to use the A/C.
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