This NRF auxiliary water pump (part code 390016) is designed to circulate coolant within your vehicle's cooling system. It plays a crucial role in maintaining the optimal operating temperature of the engine, especially during periods of low natural coolant flow, such as when the vehicle is stationary or at low speeds. Proper functioning of the auxiliary water pump is essential for preventing engine overheating and ensuring the longevity of critical engine components. This unit from NRF is engineered for reliable performance and efficient operation, contributing to the overall health and efficiency of your vehicle's cooling system. Installation of this pump should be performed by a qualified technician to ensure correct fitment and function. Regular checks of the cooling system, including the auxiliary pump, can help identify potential issues before they lead to more significant problems.