My AC will not cooling, the compressor will not turn on, the fan does blow air. on 1993 Mercedes-Benz 400SEL

how can I check ,fuse ok, how do I jump compressor, Help

Asked by for the 1993 Mercedes-Benz 400SEL
It could be that the AC clutch needs replaced.
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you might also be out of freon and it need to be rrecharged