OK, here's a new twist!

After not working for almost 2 weeks and me trying everything to make it work, the AC just started up this morning, the air recirculating button worked, and everything was good with the world again.
For 5 minutes! then it cut off again.
Stopped for a cup of coffee at 7-11, got into the car, and lo and behold it was working again for the ride into work.
So fuses are intact, compressor is working, I'm assuming all the vaccum lines are fine, etc.

Any ideas?