The Genuine BMW Auxiliary Water Pump - 64116954987 is a component of the vehicle's cooling system. It is responsible for circulating coolant through the engine and radiator to regulate the engine's temperature. This helps to prevent overheating and maintain optimal performance. The water pump is designed specifically for BMW vehicles and is made with high-quality materials for durability and reliability. It is an essential part of the cooling system and should be regularly maintained and replaced if necessary to ensure proper functioning of the vehicle.