BMW 535i xDrive fan cycling on and off continuously on BMW 535i xDrive

Some BMW 535i xDrive owners report experiencing issues with the engine fan cycling on and off continuously, which may indicate underlying problems that require attention. These issues can include a malfunctioning cooling system, as evidenced by the fan operating at loud full speed and then slowing down while idling or in traffic. Additionally, some owners note that enclosing the engine can lead to heat soak, causing the fan to run constantly. An increase in fan activity, such as longer run times and higher speeds, may suggest deteriorating components within the system. Overcharging the A/C system can also result in constant fan operation, but recharging it to the correct factory specifications can resolve this. Moreover, some owners have reported that the radiator fan cycling at maximum speed could signal a failing water pump, which might necessitate the fan compensating for the pump's inefficiency. Faulty water pumps can lead to intermittent failures and constant fan operation, indicating that the water pump could be the root cause of the fan cycling issue. It is recommended that affected owners have their cooling system, A/C system, and water pump inspected by a qualified mechanic to effectively diagnose and address these concerns.