Thanks for the reply Larry,
I had it check out at MBI in Portland OR. They determind that it was a bad temp switch. In the event that the engine is over temperature for some reason, the over temp switch shuts down the compressor to reduce load on an over-temp engine.
I was aware of the rpm/belt slip protection, and of course the low freon pressure switch.
Now I'm also aware of the over temp switch.
Here's a link to a photo of the new switch. It's bright green and located between the #1 injector and the fuel filter.
http://albums.photopoint.com/j/ViewPhoto?u=1667772&a=12785403&p=50676474&f=0