Air Flow Problem- Cold air out defrost heat out floor.

[Graplr]

So after bearing with this problem since I've owned my car, I decided to again try and figure it out. I've asked here before and investigated some but can't seem to figure it out. In the summer when my AC (parallel flow condenser AND R12) is on the coolest I get is 45F at the vent. In the winter the hottest I get at the vent ~90F. I have come to the conclusion that there is some sort of airflow problem.

Symptoms-
on Defrost- I get warm air everywhere. Same temp out defrost and side vents.
on Defrost and any other button depressed simultaneously- I get warm air everywhere
on any middle button- I get warm air on the floor and cold air out the defrost


What I've done so far-
Monovalve rebuild
New Aux Water Pump
Been through 2 different CCUs- Same symptoms on both
Disable Fresh air flap pods (the ones behind the glove box) from flap to make sure it wasn't open all the time. I took the glove compartment and watched it, it never opened and still same symptoms.

Since I get warm air out all vents on defrost I usually drive with the defrost and another button depressed to get warm air at my feet (in the winter). In the summer the cooling was okay. I usually drove around with the AC on high. Better than it was when my AC was not working.


So all in all, this leads me to believe there is outside air mixing with the heated air in the winter and outside air mixing with the cooled air in the summer. It almost seems there is some air flowing through under the defrost somewhere.

So, does anyone have any thoughts?
Is there some other sort of fresh air flap coming in the defrost vent?

This is on my 84 300SD
Thanks!
Ryan