Genuine OEM Audi Radiator Air Guide, part number 420121281B. This precisely engineered component is designed for the left side of the vehicle, channeling ambient air directly to the radiator. Its function is crucial for maximizing heat exchange, ensuring the engine operates within its optimal temperature range and preventing overheating. Constructed from durable, heat-resistant plastic, this air guide measures approximately 0.495 meters in length and weighs 0.391 kg. Using a genuine OEM air guide guarantees the correct aerodynamic shape and secure mounting, vital for efficient cooling system performance and vehicle longevity.