My A/C blows out thru the floor vents. I suspect something is amiss with the console controls not routing the air thru the correct passages.

Yes
Yes
No



Prolly have a vacuum line off, possibly in the engine compartment. A more likely cause is gonna be in the control switch(es) in the console. The vacuum switch there can/will dry out over time, and create what amounts to a vacuum leak, so when you move the lever to change the "mode", there is no vacuum to pull the servo and change the door positions.
If you can get in a really quiet area, start it up, close the doors/windows, and listen around the HVAC control in the console for a hissing noise as you move the lever slowly from position to position, stopping in each position for a few seconds to allow the switch to complete the vac. circuit. If you hear a constant hiss, that will be a vacuum leak. You may normally hear a little hiss as the doors change, but a constant hiss is a leak.
You'll prolly wind up changing the control..

Joel - Thanks Bro!

Another common problem is the diaphragm in the actuators.  There are several on an AC car.  The one that leaks is always the one that is hardest to get to.  On my '68. the bad one required removing the gauge cluster, right side dash, and entire heater box.  Then 30 seconds to change the actuator.

Good luck
Larry

My '82 blows air on the ankles, there is ducting there. Maybe your model does not have ducting to the floor.

I was checking the assembly manual regarding the vacuum leak to my defroster and the manual indicated and clearly showed electrical wiring routed over the floor duct labeled AC.