4M0816803N Genuine OEM Volkswagen Auxiliary Heater, part number 4M0819011. This unit provides supplemental heat to the vehicle's interior, often used to pre-heat the cabin or engine. It is located as part 17 in the diagram. This part weighs 0.602 kg and has dimensions of 0.325 m x 0.19 m x 0.053 m. Genuine OEM auxiliary heaters are designed for precise temperature control and efficient heat transfer, ensuring reliable cabin comfort.