do you by chance have a set of charging gauges? you may be able to adjust the amount of refrigerant with them if you knew the system operating pressures on the high and low side. there should be a tag somewhere on the system that gives the r-12 capacity. with that you can figure out how much 134 needs to go in. say the 12 system held 3 lbs of freon, 3lbs times .8 or 80 % = 2.4 lbs of r-134. did you do the 134 conversion? the system needs to be evac's and hold a vacuum for about 20 minutes or so to clear it out, then put in your can of ester oil with 134 first, then add the remaining amount of 134. may be possible to rent and evac pump from autozone or some autoparts store. if you were close by, you could stop over and i could put it on our recycler/charging station and set you right up.
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