Genuine OEM Volkswagen Auxiliary Heater Air Duct Housing, part number 2D1819434. This component is part of the auxiliary heating system, responsible for distributing heated air from the heater unit to different areas of the vehicle's cabin. It is typically integrated into the vehicle's HVAC ductwork. Made from durable, heat-resistant plastic, it ensures efficient airflow and prevents heat loss. Using a genuine OEM housing guarantees precise fitment within the complex ducting system and optimal air distribution for effective cabin heating.