No, that isn't just overflow, it is a purge line to keep air out of the cooling system. You will need to replace that line to keep the engine happy and prevent cooling system problems.
Be careful though as Audi plastic tends to get very brittle with age. While you have the system drained it might be a good idea to replace any other suspect plastic as well.
Wednesday, May 11th, 2022 AT 9:41 AM