AC vent action

'89 5th Ave. Has cold air, however the passenger side vents do not blow as strong as the drivers side-all vacuum lines look to be good and the actuators are moving when the different buttons are depressed on the head unit - any thing specific to look for?
I know the comment about cold air is off topic in Jan., however I am in Fla.-83F today!
(and the heat works also!)
TIA,
Ben III
Author: SharkHead