I've been testing again and it turns out the same situation is occuring no matter which button is pushed even the "O" button and the temp selector at any setting. Heat from the defrost vents, heat from the side dash vents and never any air from the floor vents. My feet got COLD today on my way up to Boston even though I couldn't get the scorching dry 500 degree air to stop blowing into my eyes from the defrost vents.
I agree that it could be a vacume problem. All I need now it to find the location of all the inner workings. Or at least the best place to access them from.
Thanks for you past posting!!! And so fast too.