Coolant Low after new Radiator fitted

[mattylondon]

Audi recommend refilling the system by a vacuum method as this removes all air locks. The garage may not have used that method and used the bleeding points to evacuate the air instead, which is fine, but may have had a small amount of air in the system.

I think it's nothing to worry about as this little bit of trapped air has found its way to the coolant tank after driving.