Genuine OEM Volkswagen Coolant Cooler, part number 2H0121253A. This part is responsible for cooling the engine coolant by effectively transferring heat to the surrounding air. It is positioned as the main radiator unit in the engine cooling system. The part weighs 5.367 kg and has dimensions of 0.83m x 0.1m x 0.61m. Genuine OEM coolant coolers are designed with precise fin density and flow paths to maximize heat dissipation, ensuring optimal engine operating temperatures.