The Genuine BMW Auxiliary Water Pump - 64118375237 is a small, electric pump that is designed to assist with the circulation of coolant throughout the engine. It is typically used in vehicles with turbocharged engines or in vehicles that require additional cooling assistance. This pump is a genuine OEM (original equipment manufacturer) part made by BMW, ensuring high quality and compatibility with your vehicle. It is designed to provide efficient and reliable operation, helping to maintain proper engine temperature and prevent overheating. This auxiliary water pump is a crucial component in the cooling system of your BMW and is essential for optimal engine performance.