Genuine OEM Volkswagen Engine Coolant Radiator, part number 5N0121253N. This radiator is a key component in the engine cooling system, responsible for dissipating heat from the engine coolant to the surrounding air. It ensures the engine operates within its optimal temperature range, preventing damage from overheating. Weighing approximately 5.46 kg and measuring 0.78 m in length, a genuine OEM radiator provides the correct cooling capacity and precise mounting points for efficient heat exchange and reliable performance.