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You could borrow a vacuum pump and gage set from AutoZone. Pull a vacuum and check it for leaks about 24 hours later. If it is not leaking, buy a lottery ticket because you are very lucky, then spend $20 at Big Lots for R-134A and recharge it. You may have to spend another $15 for compressor quick charge fittings to convert to R-134A. The older hoses will leak slowly over time so plan to add a can of refrigerant every few months or so.
A more likely scenario is that you will have leaks and it will be a PITA to fix them all. There are a lot of threads that talk about improving the A/C to better than original performance. It is just a matter of how much time and money you want to spend.
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