This NRF auxiliary water pump (part code 390087) is designed to circulate coolant within your vehicle's engine, playing a crucial role in maintaining optimal operating temperatures. Proper coolant circulation is essential for preventing overheating and ensuring the longevity of engine components. This pump works in conjunction with the main cooling system to manage heat effectively, especially during idle or low-speed driving conditions. NRF is a reputable brand known for its quality cooling system components. This auxiliary pump is built to meet or exceed original equipment specifications, providing reliable performance and durability.