Even though I don't have a kit yet, I still have a donor, and at the very least it needs some engine work. As far as I know, the AC is charged. What is my best bet for properly draining the AC loop without venting to atmosphere? My old neighbor's advice was just crack the system open and let time do the work, but, uh, well, I care about the earth somewhat. Not really sure who to ask about this. There's a local shop that I might be able to convince to make a house call if they have the equipment, but otherwise, I have to trailer the donor somewhere. I didn't see any obvious hits on search.