Genuine OEM Audi Coolant Hose, part number 5C0122157J. This hose is a vital component of the engine cooling system, responsible for carrying coolant between various engine components to regulate engine temperature. It is positioned within the engine bay, connecting specific cooling system parts as shown in the assembly diagram. Weighing approximately 0.147 kg, it is constructed from durable, heat-resistant materials. Choosing a genuine OEM coolant hose ensures the correct routing geometry, material composition, and pressure resistance, preventing leaks and ensuring optimal engine cooling performance.