What vacuam line is needed for the A/C?

those lines you are talking about have nothing to do with the a/c. the second line down on the drivers side vacuum tree is the only one that deals with the air conditioning. it goes all the way to the passenger side of the car before going into the firewall. having that line broken will cause the a/c to only blow out of the defrost vents.
 
I was meesing with my AC a few weeks ago, Actually got it working!! You may know this already but here ya go...if the compressor isn't coming on try jumping the pressure switch in the rear of the engine bay, pass side, see if comp comes one. if it does you may have a bad switch or a leak. I put a can of 135a in with the switch jumped, cold air, to my surprise...pulled the jumper out, reconnected, still working. shut down and listened for aleak. Found it, replaced the o-rings, good to go. maybe that will help a bit.
good luck