Genuine OEM Audi Heat Exchanger, part number 8E1820031. This component is designed to efficiently transfer heat between two fluids or a fluid and a solid, playing a critical role in the vehicle's climate control system. It is typically located within the HVAC assembly, regulating cabin temperature. Weighing approximately 1.08 kg and measuring 280mm long, 147mm wide, and 58mm high, it is built to precise specifications. Choosing a genuine OEM heat exchanger ensures exact fitment, proper thermal efficiency, and long-term durability, preventing leaks and maintaining consistent cabin comfort.