I am converting my 80 Monte Carlo to 134a. I have a new compressor, drier, and orfice tube. I am having trouble getting the old orfice tube out. The line is crimped I see. Is there a trick to it? Beings the line is crimped do I have to replace the evaporater? I have all ready broke part of the end of the orfice tube off already. I figured I better ask for help before I f it up any more. Thanks!