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- Is there a way to decon the used A/C parts
- I'm pretty sure the 'freon' is out...how do I make SURE
- Once together....is there anyway I can check for leaks? is there a DIY dye I can add?
- After it is all together, I plan on having it converted from freon. Can I do this myself now since the freon is out?

It's a commercial A/C website, but lots of good info available on their forum:

http://www.autoacforum.com/