Genuine OEM Volkswagen Coolant Air Guide, part number 5H0121283T. This air guide directs airflow to the coolant reservoir and additional coolant coolers for enhanced cooling efficiency. It is positioned on the front of the cooling assembly, indicated as part 4 on the diagram. The part is constructed from durable materials suitable for engine bay conditions. Genuine OEM parts are essential for maintaining the precise airflow dynamics required for optimal cooling.