NO AC
 

I have 91 Honda CRX. Tried converting the R-12 to R-134a ac system.
I got some freon into the system, however it is not cooling down
significantly. I have the same problem for an 88 cadillac deville,
4.5L. . I did the following for both cars. While car was running
evacuated what remained of the R-12, within a few seconds. Then
reversed the procedure and recharged the system, with the ac running
on high. For some unknown reason it only takes less than 12oz
[5psi]? Any suggestions will be helpful. Why will it not take
anymore or get colder.