R134 Conversion Woes - Evaporator Freeze-Up

I did the 134a “conversion” on a 74. Worked well. Guess because of the EPV valve. If you have further problems a work around is a thermostatic switch to cycle the compressor on and off. (Didn’t notice a mention of this in the thread. May have missed it.)
I won’t bother with 134a anymore for r12 systems. I will use (hope this doesn’t get anyone riled up) one of the “drop in” replacements that I probably shouldn’t name. I like the advantages of it. Less likely to leak being at the top of my list. You can order it off the net.