Air vents in most vehicle are surprisingly simple to fix , but are a part of a complex AC system. The air vent is the last part which drivers and passengers tough daily and which do need repair and maintenance. This video link shows other components of the vent , not viewable unless the vent is removed. The video ends with a simple VentTabs installation , which often restores the air direction control within the vehicle's cabin.
Click this link to see the video : https://youtu.be/0YSnj9XMpl8