Genuine OEM Volkswagen Charge Air Cooler, part number 2HJ145749J. This component cools the compressed air from the turbocharger before it enters the engine, increasing its density and power output. It is located at the front of the vehicle, within the intake system. This unit weighs 4.985 kg. Genuine OEM charge air coolers are manufactured with precise internal fin designs and robust sealing to ensure optimal heat exchange and prevent boost leaks.