As far as I know (and someone please correct me if I'm wrong) but the two vents in the middle share the same duct but just split to make the two vents. If that's true then both vents should have the same amount of flow unless something has clogged up one vent.

Unless anyone states different, I'd suggest pulling the center console/bezel and checking to see if anything is in the duct.

Just my two cents :shrug: