AC Experts

[4shongo]

My system was converted/updated years ago to 134A. When I charged it at the beginning of the summer I put in around 4lbs of 134A. 134A is typically around 75%-80% of the R-12 charge. Since perfect weight is unknown, I would suggest you charge by pressures on your gauges.

Oil is a different issue. Since oil travels throughout the system with the refrigerant it will be hard to tell you how much to put in. If you are replacing the compressor, drain the old one and measure the oil. Replace with that amount plus a few ounces if there was a leak in the system.

Sorry, no perfect answer unless you start with all brand new components, hoses, etc. Hope this helps some!