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What is a serpatine belt BMW?

Serpentine belt is a type of belt that drives multiple auxiliary devices in a vehicle, such as the water pump, power steering pump, air conditioning compressor, and alternator. It is a single, continuous belt that wraps around the pulleys of these devices and is tensioned by an automatic tensioner.

In BMW vehicles, the serpentine belt is responsible for driving these auxiliary components and is an essential part of the engine's operation. If the serpentine belt breaks or becomes loose, it can cause these components to stop functioning, which can lead to overheating, loss of power steering, or other issues.

It's important to follow the manufacturer's recommendations for inspecting and replacing the serpentine belt as part of routine maintenance to ensure that it is in good condition and functioning properly.