Part numbers 16100-39456, 16100-39455, 16100-09440, and 16100-09441 are engine water pump assemblies used in Toyota and Lexus vehicles, designed for the 3.5L 2GR-FE V6 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.