By Law, you a supposed to empty the refigerant from the system with a recovery machine into a recovery bottle, before openng the lines up. It may not have anything in there. If it's still R-12 in there, it's very expensive to replace if you can even find it.
Why are you pulling the compressor?
__________________ I contend, that for a nation to try to tax itself into prosperity, is like a man standing in a bucket and trying to lift himself up by the handle.
—Winston Churchill
1967 Mustang Convertible - 289-4V w/C4
1992 Bronco - 302 EFI Auto | 
1967 Mustang AC compressor removal 
