Genuine OEM Audi Radiator Coolant Upper Hose, part number 1C0122101AS. This essential hose carries coolant from the engine to the radiator, playing a critical role in engine temperature regulation. It is positioned as the upper hose in the cooling system. Constructed from durable rubber, it measures approximately 0.42 meters in length and weighs 0.434 kg. Choosing a genuine OEM coolant hose ensures precise fitment, correct routing geometry, and resistance to high temperatures and pressures, preventing leaks and maintaining cooling system integrity.