Hope I don't get flamed for this long post, but here's some info I
saved on experiences with using HFC-134a in systems designed for R-12.
This is of special interest to me since the A/C in my '91 Camper
doesn't work so this might be the time to make the switch...

Here's the info:

>From mark@wdcwdc.sps.mot.com (Mark Shaw)