when we evacuated, and re-charged with 134a.. we put in what had to be close to the correct amount??? System calls for 2.9 lbs or r-12.. we put 2.45 lbs of 134a..

you had to much r134a r134a has a higher pressure so u only need about 1 1/2 pounds of it if i'm not mistaken
also with r134a your aux fans come in a little sooner than
when you run r12 unless you change the pressure switch at the receiver dryer.enjoy