Genuine OEM Volkswagen Coolant Cooler, part number 2HJ121003. This component cools the engine coolant, preventing overheating and ensuring efficient engine operation. It is located in position 1 of the diagram. Key specifications include a length of 1.03m, width of 0.455m, and height of 0.145m. Genuine OEM coolant coolers are designed for optimal heat dissipation and durability, ensuring reliable engine temperature regulation.