Genuine OEM Volkswagen Water Cooler, part number 5QM121251S. This component is the primary radiator responsible for dissipating heat from the engine coolant. It is located at the front of the vehicle, typically behind the grille. This unit measures 0.76 meters in length and 0.47 meters in width. Genuine OEM radiators are manufactured to precise specifications to ensure optimal heat transfer and long-term durability.