Believe it or not, I didn't get back to this problem until about a month and a half ago. I bought an aftermarket compressor, and it solved the problem. I believe that the rebuilt compressor worked perfectly with a full charge, but stopped after any minor amount of leakage. And because it wasn't compressing, it stopped leaking, and therefore I couldn't find the leak.

The only oil and dye that was visible was right at the compressor connections, which was there when I put them on. So either they hadn't been tightened enough each time this compressor was installed, or the compressor itself leaked right at that spot.

I'm sure that the guy who rebuilt it tested it at full capacity, and didn't run it long enough for it to stop working. And he tested it again after I returned it and still insisted that it worked.

The reason I stopped working on the A/C on this car is that it developed an ETA problem. I went through several reman ETA's before giving up and going with a new Bosch.

I think that some people who rebuild parts are over confident in themselves, and don't do the necessary testing before selling their parts.