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Original R12 is worth a good bit of money. I would see if there is any way to clean the evaporator without messing with the freon. R12 was supposed to be better, with 134 requiring higher operating pressures. System pressure with the system stabilized should be close to ambient temp. If it provides good cold air then why mess with it, if there is anyway to clean the evap without dumping the charge.
We used to un bolt the compressors and leave the lines attached, even when changing the engines, some people would come back and try to tell me their ac worked perfectly before I replaced the engine. Without ever disconnecting the lines they had little ground to stand on, I'd toss some gauges on it if it had any freon and they hadto payme to fix the ac which usually ended the discussion until summer.
regards
mech
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