[Lawrence Coppari]

I am assembling my system with a new Sanden compressor and receiver/dryer. Next step is charging the system. I realize that pulling a vacuum is recommended.

I believe this is necessary so that all the oxygen is removed from the system. Oxygen permits corrosion to occur so it seems logical to me.

But what about purging the system with either nitrogen or carbon dioxide. This would push all the free oxygen out. Once upon a time many years ago I purged with R12 when it was legal to vent and when it was cheap. It worked just fine. The system on that car still operates.

What do you guys think?