Genuine OEM Audi Coolant System Vent Hose, part number 4S0122449B. This hose is crucial for allowing air and steam to escape from the engine's cooling system, preventing air pockets and ensuring proper coolant flow. It connects to the expansion tank and other components within the cooling circuit. Weighing approximately 0.098 kg and measuring 0.225 meters in length, it is a small diameter, precisely routed hose. Using a genuine OEM vent hose guarantees the correct material, diameter, and routing, which are vital for maintaining system pressure and preventing coolant loss or overheating.

Catalogue entry: HOSE.