Genuine OEM Volkswagen Coolant Hose, part number 7LE819362L. This hose is responsible for carrying coolant between various engine components and the heater core, facilitating the vehicle's heating system. It is located at position 17 in the diagram. The hose is constructed from durable rubber to withstand engine temperatures and pressures. Genuine OEM coolant hoses are manufactured to exact specifications, ensuring proper flow rates and resistance to degradation, which is crucial for maintaining engine temperature and preventing leaks.