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Hi. Let's start with the pressure switch. It has three wires, but if you unplug it, it has only two terminals. It is a low pressure switch only. The low pressure side is what cycles the A/C system. To verify system pressure is the issue, with key in the on position, not running, a/c on, use a small jumper wire to connect the two terminals in the pressure switch plug together, (not the switch itself). You should hear, and see the compressor clutch kick in. If it does, this proves low refrigerant. If not, it is either a clutch, or electrical issue. As for the 134a, it's not comatible to mix with R12. A proper conversion means removing all old R12, changing the filter/dryer, (the piece the pressure switch is mounted to). Big expense. See if you can get a refrigerant that is compatible with R12 systems. Add a leak sealer first, as well. Preventative maitanance. Let us know how it goes. Jim.
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