Genuine OEM Audi Engine Coolant Hose, part number 8Y0121103. This critical component is designed to transport engine coolant, playing a vital role in regulating the engine's operating temperature and preventing overheating. It is specifically located on the left side of the cooling system, connecting to the radiator. Made from high-quality, heat-resistant materials, this hose weighs 0.17 kg and ensures a leak-free connection and consistent coolant flow. Choosing a genuine OEM hose guarantees the correct routing geometry, material composition, and resistance to thermal cycling and pressure, which are crucial for the long-term reliability of the engine cooling system.