Genuine OEM Audi Auxiliary Cooling Radiator, part number 4K0121212C. This radiator provides supplementary cooling for the engine or other critical components, especially under demanding conditions, to maintain optimal operating temperatures. It is typically installed on the right side of the vehicle's cooling system. Weighing 1.088 kg, this compact radiator measures 0.282 m in length. Choosing a genuine OEM auxiliary radiator ensures proper heat exchange efficiency, durable construction, and seamless integration with the existing cooling system, preventing overheating.