Ac/Heat not coming out of vents

[MasterBubba]

The defroster, heat, and AC works great when coming out of the floor, but I'm not getting anything out of the vents. I can reach my hand behind the dash and open a door, allowing air to come through. Anyone know what could be causing this problem?

 

[bedrck46]

Ok its a Gen 1 but what year and which climate system does it have Even though its a gen 1 there are some differences between the years