Genuine OEM Audi Heating Hose, part number 4E0819373AF. This hose is an essential component of the vehicle's heating system, responsible for circulating hot coolant. It is typically located within the engine bay, connecting various heating system components. Weighing 0.172 kg, this hose is designed for durability and resistance to high temperatures and pressures. Using a genuine OEM heating hose ensures the correct routing geometry, material composition, and fluid resistance for reliable and leak-free operation of the heating system.