Evaporator temperature switch

You mean an electrical switch, with gas tube stuck in the evaporator fins? The factory AC in my 1969 Dart only had the gas-tube expansion valve on engine bay side near firewall. Perhaps later cars had an e-switch at the evaporator (in climate box). My 1985 M-B has that, termed "anti-ice switch" which disables the compressor clutch. When it fails, it disables the compressor (how I found it). I found an almost identical used one, also made by Ranco, for a 1970's Chevy, with just one mounting hole off. You slide the gas tube inside a tube which routes it into the evaporator fins. I recall I was even clever enough to match the insertion depth to the old one. I later found several new ones on ebay cheap, so good for life. If to protect for ice, the refrigerant shouldn't matter. If the universal one looks like yours, "should work". The switch should go open if "too cold", which is likely set near 0 C.