Genuine OEM Volkswagen Heat Exchanger, part number 1J1819031B. This component, often referred to as a heater core, is responsible for transferring heat from the engine's coolant to the air circulating through the vehicle's cabin. It is typically located within the HVAC system behind the dashboard, designed for Left Hand Drive (LHD) configurations. Weighing approximately 0.95 kg, it features a robust core construction for efficient heat transfer. Opting for a genuine OEM heat exchanger ensures precise fitment within the HVAC housing, optimal heat output, and leak-free operation for reliable cabin heating.