2015 F250 rear crew cab vents low air volume

I have a 2015 F250 Super Duty with a crew cab and the rear vents are barely blowing any air in either the heat or AC setting. The front vents are okay. The truck was obtained from a TX dealer and was dusty inside so thinking that the evap coil needs a cleaning. Also looking at installing the 19811 filter to help. Just wondering if there is something else I need to look into for the rear air volume as well.

 

Do you a center console with vents or is it the vents under the front seats. If it's the vents under the seats I've noticed they never pushed a large volume of air. Just enough to give the rear passengers a bit of air. It's been like that since the truck was new.

 

These are the vents from the center console. You can barely feel any air flow.

 

I would assume there's a separate fan for those. It might need replacing. Or a good cleaning at least.