Genuine OEM Audi Coolant Hose, part number 8K1819373AB. This hose is a component of the heating and A/C system, responsible for circulating coolant. It is positioned within the heating and A/C assembly. Constructed from durable rubber, it is designed for reliable fluid transfer. Genuine OEM coolant hoses are manufactured to precise specifications, ensuring proper fitment and resistance to degradation for optimal system performance.