The Genuine BMW Auxiliary Water Pump - 64118381989 is a component of the vehicle's cooling system that helps circulate coolant to prevent the engine from overheating. It is designed specifically for BMW vehicles and is made with high-quality materials to ensure durability and reliable performance. This auxiliary water pump is an essential part of the vehicle's engine cooling system and helps maintain optimal engine temperature for efficient operation. It is a genuine BMW product and is compatible with various models, ensuring a perfect fit and proper functioning.