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It's already been retrofitted to R-134a if it has that cap.
If you're lucky, it's just a combination of bad schrader cores and hose leakage, but you might as well replace all of the o-rings while it's still empty. Jump the low pressure switch to see if the compressor does work. You may be able to save some money and just charge it, but there's a good chance you'll be spending more money to fix the underlying problem anyway, plus more refrigerant at $9 a 12 oz can. You really need to vac it down and replace the drier (like $12 here on pelican), since non-condensables like air will hurt system performance, and moisture makes acids, which destroy things. Heck, might as well flush it out, as there's no telling what kind of crap is in the system and how the retrofit was done.
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky
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