Any AC Techs

I was driving the car Sunday and the ac compressor quit along with the fan. Check the fuse and it was good. Took the dash apart to get at the vacuum switch. Tried to test the contiunity and it's dead. Orderd a new one from NAPA, and it will be here Thursday. Checked the fan resistor and it was ok.
Since I have the dash apart, where would the cycling switch be located? I don't see anything on the air box, unless it's on the back side.

I hate working on anything behind the dash! It has to be the worst.
Thanks for all the help.