There's usually a low pressure switch on suction line. If you are low on freon, the switch turns off the compressor. You could short out the switch and see if compressor turns on. If so, you have a leak someplace. Systems don't lose freon, it leaks it.
I had a 1991 grand caravan which I finally sold. Got tired of chasing leak after leak after leak. It was R12.
Never used 134A in place of r12. I think there is something to do with old r12 compressor oil not mixing well with 134A. Not sure. talk to professional.
Age rots hoses, compressor seal, evaporator and condenser coils leak, steel lines rust.
Hard to find leaks. GOOD LUCK> Keep us posted on what you find.
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