Genuine OEM Audi Engine Heater Coolant Hose, part number 80C819373G. This hose is an integral part of the vehicle's heating and cooling system, specifically designed to circulate warm coolant to the heater core, providing cabin heating. It is positioned within the engine bay and connects to various components of the coolant circuit. Weighing approximately 0.17 kg, it is manufactured from high-quality, heat-resistant rubber compounds. Using a genuine OEM hose ensures precise fitment, correct routing, and resistance to temperature extremes and pressure, preventing leaks and maintaining heating system efficiency.