So there I was at 30,000 feet, with two MiGs on my tail, somewhere over Washington DC, with the outside temperature around 97 degrees, and my beautifully-functioning A/C suddenly started blowing ambient outside air temp...the system strained to keep up by increasing fan speed / air flow, but no more cold air.

Aborted trip, landed, checked fuses, waited until dark, fired engine up, A/C worked again. This morning enroute to work, no cold air. Recently had new pushbutton unit, new aux water pump and new monovalve repair ket installed. Is it my monovalve again, or did I suddenly lose all my freon?

A million dollar reward for the right answer.....

JoeB