Genuine OEM Audi Coolant Hose, part number 5N0122101BF. This essential component is responsible for circulating coolant throughout the engine cooling system, ensuring optimal engine operating temperature. It is positioned within the complex network of pipes and connections, often near the radiator. Made from durable, heat-resistant rubber compounds, it is designed to withstand high temperatures and pressures. Using a genuine OEM coolant hose guarantees precise fitment, correct routing geometry, and resistance to degradation from engine fluids, preventing leaks and maintaining cooling system integrity.