Water Valves
The water valves on the E60 are of the same design as used on previous models. The valves are normally sprung open and are pulse width modulated by the IHKA control unit. The IHKA control unit controls the valves via the B+ circuit, both valves are grounded at a common location. The valves are powered closed by the IHKA module when full cooling is needed. They are located on the driver's side strut tower.