You goofed ~ this is why you evacuate the system then let it sit a few hours with vacuum ,to see if it has a slow leak .

To change it back to R-12 , you must needs open the sysem again and flush it completely , replace the reciever-dryer & oil but *not* the expansion valve then you must needs evacuate it and test again before putting R-12 in .

If it gives you 60° F at the vents now , that's as good as it'll ever get , leave it alone .

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better