Genuine OEM Volkswagen Coolant Cooler, part number 1S0121253AQ. This component functions as a heat exchanger to regulate the temperature of the engine's coolant. It is positioned as part 1 in the cooling fan assembly diagram. The cooler has dimensions of 0.73m length, 0.232m width, and 0.095m height, with a weight of 2.244 kg. Genuine OEM coolant coolers ensure precise thermal management and durability for optimal engine performance.