I have switched many over by just refilling them with R-134. The manufactures claim the oil in compressors is different but I have not had any trouble yet.
I would only change it if the old system is out of freon. The R-12 will cool faster than R-134. The R-134 does not transfer energy quite as well as R-12.
The Older JD cabs, 30 and 40 series, would freeze you out with R-12 but just cool you with R-134.
I do switch them just because of the freon cost but they don't work as well.
I do think the best way is to flush out the lines and install a new re-dryer. Evacuate the system and recharge it with R-134. Almost all of the new compressors in the last fifteen years have oil in them that is okay with either freon.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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