Genuine OEM Audi Auxiliary Heater Coolant Hose, part number 4G0819674. This hose is designed to transport coolant to and from the auxiliary heater, ensuring its proper function in providing supplemental heating. It is a critical component for maintaining the auxiliary heating system's efficiency. With a length of 0.078 m and weighing 0.025 kg, this hose is engineered for specific routing. Choosing a genuine OEM coolant hose ensures the correct material resistance to heat and pressure, exact routing geometry, and leak-free performance.