I have a problem with some of this. I have never seen a temperature switch on an automotive AC system under the hood (yet). What year did Jeep start doing this? My 85 & 87 do not have thermal AC switches under the hood nore do they have LPCO switches nore do they have LPCO switches. What year did Jeep add the LPCOs and Thermal switches to the low pressure side?
There is an electronic thermal sensor in the Evaporator core area on mine which I think is designed to cycle the compressor if the evaporator gets too cold, cold enough to ice up.
The accumulator / filter / dryer on my 85 an 87 are on the High Presure side are right after the condensor and just before the expansion valve. My 85 also has a high pressure releif valve on the FDA (Filter Dryer Accumulator).
I also disagree on the need for filter dryer replacement when switching to R-134a. When any R-134a containing refrigerant is used to replace R-12, the filter dryer must be replaced as the old style R-12 dryer desicant is not compatible with R-134a (or its oils, I forget which), as the new R-134a & its oil will disolve and or destroy the old style R-12 desicant such that it blocks the refrigerant flow, and can throw solids into the flowing refrigerant. As I recall it sort of party disolves and partly brakes up the beads so that sticky fine remains of the beads get picked up and circulate in the system, then they can stop up the expansion valve, or seal off the dryer exit pipe, or get into the compressor and then end of story.
The old R-12 desicant is not immediately destroyed, it is a slow gradual process, but typically happens over several months.
Also anytime you open a system it is recomended to replace the dryer, especially with the rinky dink hardware these shops use to pull a vaccum these days.