Genuine OEM Audi Cooling System Ventilation Line, part number 4G0121081CS. This hose is crucial for facilitating proper air circulation within the cooling system, helping to prevent air locks and ensure efficient engine temperature regulation. It is typically located on the rear left side of the engine cooling assembly. Constructed from durable, heat-resistant rubber, this line is lightweight at approximately 0.016 kg. Opting for a genuine OEM cooling line guarantees the correct routing geometry, material resistance to coolant, and reliable sealing for optimal cooling system performance.

Catalogue entry: PIPE left rear.