For what its worth, A/C never JUST needs a charge. Especially if it's been sitting without. But that's up to you. I don't really care about A/C, but if you do, that will be a high-ticket item... Also, don't these have troublesome engines (single row timing chain)? I would guess, though, if it's still running at 225k, most of the typical bugs will have been worked out.

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1989 300E 144K