Genuine OEM Volkswagen Engine Auxiliary Heater Coolant Hose, part number 1K0121157EN. This hose is a crucial part of the vehicle's cooling system, specifically designed to circulate coolant to and from the auxiliary heater. It ensures efficient heat transfer for supplemental cabin heating or engine pre-heating functions. This hose is positioned within the engine bay, connecting various components of the auxiliary heating circuit. With a length of approximately 0.395 meters, it is engineered for specific routing and temperature resistance. Opting for genuine OEM guarantees the correct routing geometry, material durability, and resistance to coolant chemicals for leak-free and reliable operation.