Genuine OEM Volkswagen Coolant Hose, part number 3Q0819350E. This hose is part of the vehicle's auxiliary heating or climate control system, responsible for circulating coolant to heat exchangers. It is positioned within the engine bay and cabin heating circuits. Constructed from high-quality, heat-resistant rubber, it is designed for specific routing and flexibility. Genuine OEM coolant hoses for climate control systems are engineered to withstand the required temperatures and pressures, ensuring efficient cabin heating and defrosting.