Genuine OEM Audi Coolant Hose, part number 1K0122101LE. This essential hose is responsible for circulating coolant between various engine components and the radiator, playing a critical role in regulating engine temperature and preventing overheating. It is positioned within the engine cooling system, connecting specific components as shown in the assembly diagram. Constructed from durable rubber, it weighs approximately 0.539 kg and has a specific curved geometry for precise routing. Using a genuine OEM coolant hose ensures the correct material composition for heat and pressure resistance, exact routing geometry to prevent kinking or rubbing, and reliable sealing, all vital for the longevity and efficiency of the engine cooling system.