OE number 16100-39545 is a genuine Toyota engine water pump assembly part number. This part is primarily for Toyota models equipped with a 4.0L V6 (1GR) engine.

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.