W123 aircon doesn't start.

Hi,
The aircon (not clima) in my trusty 280CE from '84 doesnt start up any more.
When i turn the wheel, the compressor doesn't start. The belt is OK, seems
nice and tight and in good condition. So where can/should i start troubleshootin? What are most likely point of failures, set aside the fuse, which is OK ?
Thanks,
Jesper
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Most likely you lost freon... pressure too low that it won't come on.
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