2019 A6 Prestige, I am getting very little air flow from the center vents. In all settings including auto and in manual with fans on high and center vents chosen. I get a lot of air from the side vents left of steering wheel. Dealer told me that it was normal but I think that there is something else amiss. If the system is working properly as it is then there really is no use for the center vents to exist.