Make/model/year always helps.

"my system imediately pulls to the low side cut off and shuts down the compressor. "
From here it sounds low on refrigerant. It sounds like the LPCO is doing its job.

Have an AC shop test for leaks, evacuate, and recharge by weight

Cusser, you can get your 609 here: https://ww2.epatest.com/ The test is really not that hard, you already know at least 75% of the answers and further, you are a smart guy and it is open book. For a guy like you, it would prolly be a good idea. Might even consider getting your 608 in case you want t...

Cusser, our wonderfully devoted EPA forced eBay to ban R12 sale. You may still be able to find it on facebook marketplace. Eventually, tho, he will end up with 134. I would bite the bullet and do the conversion. You will have to adjust the POA valve, or get one from eBay that has already been adjust...

Indeed....

"I discovered that the pressure switch is not activating the High fan speed" This will definitely impair the system. Sounds like your flushing method was quite acceptable. When you say the refrigerant is 137a, do you mean to say 134a? "Now what intrigues me most is the compressor is c...

You may also have what we call re-heating. Your blend doors may be acting up and allowing heated air from the heater core to over mix into the cooled air. The hot air always wins.

"low pressure is around 45 - 50 and the high pressure is around 180 - 200" I assume these readings were taken at idle. Idle pressures have little meaning, as the comp does very little work at idle. No mobile AC does well at idle ie in traffic and stop lites, etc. The set of pressures at 20...

The 2 old switches should be in series with the hot wire to the compressor relay. So, if either were to open, the comp would shut down. So, for one of the switches (it matters not which one), wire the two harness wires together. For the other switch, connect the 2 harness wires to the 2 new switch w...

I should have specified getting into first gear (non-synchro) can be the challenge. Glad you are gonna try it first

2 of your links are "file not found"