to do it right takes some equiment. but you can do it yourself. just don't think that it as good as a shop will do it. best you can do at home is open up the system and drain out as much of the oil as you can. then use new "o" rings put it back together and fill with the replace ment R-134 from the kit. remember that it takes less R-134 that R-12 so don't use as much. I think it's like 15% less by volume.
