This NRF auxiliary water pump (part code 390017) is designed to circulate coolant within your vehicle's engine. It plays a crucial role in maintaining the correct operating temperature, preventing overheating and ensuring efficient performance. Proper functioning of the auxiliary water pump is essential for the overall health of your cooling system. It works in conjunction with the main water pump to provide consistent coolant flow, especially during idle or low-speed driving conditions where natural airflow might be insufficient. NRF is a trusted brand known for its quality cooling system components. This pump is built to meet or exceed original equipment specifications, offering reliable performance and durability for your peace of mind.