Fan Clutch - E36, E46, E34, E39, E60, X3, X5, Z3, Z4, M50, M54, S52

This part is listed by BMW as BMW part number 11527505302 (11-52-7-505-302) and is described as Fan Clutch - E36 E46 E39 E34 X5 & other 6 Cylinders. 

The common failure of these fan clutches is they will eventually stop engaging, and leave your engine overheating while parked or in stop-and-go traffic. Replacing a failing or failed fan clutch will allow the engine fan to do its job once again, and can avoid costly overheating related repair bills.

This part is manufactured by an aftermarket supplier of European auto parts, including many cooling components. While not carrying OEM status, this part follows the design of the original very closely and uses similar materials. An aftermarket part may even have the same TUV approval as its OEM counterpart. The brand may even be OEM to another manufacturer besides BMW. This aftermarket brand has a two year warranty - the same as Genuine BMW and OEM brands.