There is an important part named fan shroud in the cooling system. The fan shroud covers the area around the cooling fan. This device is designed to realize three main functions: cooling function, safety function and noise reduction. For the first one, the fan shroud routes the flow of air toward the radiator to keep the coolant cool. A worn fan shroud will cause the engine overheated easily. For the safety function, the fan shroud protects the fan blade from debris entering and damaging the fan, and also protects your hand from entering it. For the last one, the fan shroud reduces the turbulence, allowing for smoother flow of air through the cooling system thereby reducing noise. With so many important functions, fan shroud should be in top shape all the time. Replace it once you find there is something wrong with it, and we are glad to offer you BMW genuine fan shroud with a cheap price.