Thanks, Craig! I rebuilt the Monovalve and it seems to have fixed the problem perfectly. I idled for several minutes after the engine was well warmed up, and I couldn’t get the A/C to blow hot. Cold as can be! The heater also works if I turn the dial to hot. What a quick, cheap & easy fix! I can’t thank you enough, and my wife says thanks as well. After all, it’s her car. I drive an '83 wagon, she drives the '82. So now I know what to do if this happens on the '83 at some point.

There is one question that I have that came up as I was testing everything. When I turned the controls to defrost, there was still hot air coming out of the two center vents. Is this correct? It seems that I have heard it is not supposed to be that way. It makes me wonder if the vacuum pod above the two center vents is broken/leaking. That’s the only one I couldn’t seem to get to in order to test it. Can anyone give me any tips on trying to test that pod without ripping the entire dash apart? I just don’t have the time to do that at this point before our trip. If I am able to test it in the car, and it’s leaking... is there a way to block off that particular pod without hurting or disabling the rest of the ACC system?

Thanks again for all of your prompt responses and wonderful help! It is fantastic to have the A/C working!

-Brett