So, I've got an update. I'm pretty much totally boned, the universe doesn't want this project to succeed. I evacuated the duracool and decided to change out/inspect the orifice tube to see what was going on and replace it with a new one. I open it up and pull the tube out and it's COVERED in crud, like grade A sand/crud. So..... that sucks, where the hell did this come from? I flushed all the lines and the new condenser very thoroughly before this was put back together. With this much crud right at the orifice tube the only thing I can figure is it's coming out of the condenser for some reason or it's coming out of the compressor. I pulled the line to the rear evaporator loose and ran flush through it to confirm crud there too and a whole bunch of the same crap came out, so my expansion valve in the rear is probably boofed now too, NICE!
So to figure out where it came from I decided to see if it was downstream of the compressor and upstream of the condenser. I pulled the discharge line from the compressor and ran flush through it, sure enough, a bunch of similar crud came out with some obvious metal shavings.
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I'll need to pull some more components out to flush the suction line into the compressor to see what is there, those lines are more difficult to get to, i need to pull the whole rear AC unit out again. I suspect there will be none or very little. I didn't run this very long and I bet the accumulator caught anything that made it past the orifice tube in the front and I bet the expansion valve in the rear caught a fair share too. Only thing that might be there is something that made it past the expansion valve. So, suffice it to say, i'm going to pursue a replacement compressor and now have to pull the condenser and try to flush really good and I guess replace the accumulator and maybe rear expansion valve. What a freakin' disaster.