Genuine OEM Audi Engine Coolant Hose, part number 4H0121447S. This hose is a vital component of the engine cooling system, responsible for transporting coolant to regulate engine temperature. It is positioned on the left side of the cooling system, connecting various components. Weighing 0.112 kg and measuring 0.21 m in length, it is designed for specific routing. Choosing genuine OEM ensures the correct material composition, heat resistance, and precise routing geometry for reliable coolant circulation and optimal engine thermal management.