The Nippondenso compressors on my '87 560SEL and '87 560SEC both developed leaks where the hoses connect to the compressor. Six o-rings for each fixed the leaks and it was a DIY project.

What kind of compressor do you have?? The stem is the same as a tire valve so a auto parts store tool will remove/replace them.

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There is a very fine line between "hobby" and "mental illness."
FrankenBenz: '87 560SEC with an '02 cammed LS6 and custom 4L60E.
Bling: '87 560SEC, ported/polished, lowered
Lisa: '87 560SEL, lowered