Part number 5N0 965 561A is an engine auxiliary cooling water pump. It is an original part number used by the Volkswagen Group (including Audi, Volkswagen, Skoda, SEAT, and Porsche).

Although the car water pump has a simple structure, it is the power source for the engine cooling system and is crucial to the engine’s health. Understanding its function, working principle, and common faults helps car owners to identify potential problems in a timely manner and perform proper maintenance, thus avoiding major issues and protecting the expensive engine.