all vents Blowing hot except drivers side
 

Hi All just after some help during these cold times have a 2017 a6 c7 Avant type 4GD with 4 zone hvac with heating on hi all vents front, back and b posts are blowing nice and warm but all the drivers vents dash and foot well are cold
don't really know much about the car only had it a year looking for some help or guidance as to where to start as after a 15 minute drive my feet are stone cold
any help would be much appreciated
cheers lee :)