Dash air- fixed it!
As many threads as Iíve looked at about everything blowing through the defroster, I failed to find my solution. The threads did convince me that it was a vacuum problem. I started at the three dial controls and traced the small vacuum lines to where they went, but didnít find a problem. I found a YouTube video of a guy whose chickens had kicked a vacuum hose loose, and I had not found the place where his line was disconnected, so I found it. I donít have any chickens, but over 19 years mine had deteriorated and come loose. I found a little piece of rubber hose that fit tightly over the line and the connecting point, and all is well. It was one of three lines going into about a 12 inch square box on the passenger side, about even with the front wheel. Iím like James Brown, ďI feel good!Ē