Genuine OEM Audi Heater Coolant Hose, part number 8R0819373M. This hose is responsible for circulating hot coolant from the engine to the vehicle's heater core, enabling the cabin heating system. It is positioned within the HVAC system's coolant lines, connecting to the heater core assembly. Measuring approximately 0.29 meters in length and weighing 0.132 kg, this hose is designed for flexibility and heat resistance. Opting for a genuine OEM hose ensures precise routing, proper diameter, and robust material construction to withstand high temperatures and pressure, preventing leaks and ensuring efficient cabin heating.