W123 - what does this part do?

midnight blue

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Your Mercedes
W123 230e
Hi
Newbie here. Tried a search but not sure what to look for and couldn’t really find anything. So apologies if covered before.

I’m looking to figure out what below circled part does. Did a closer up and a further away picture to show location.
It’s a 1984 w123 230e. I think it’s vacuum related.

Also. Power currently not plugged in and insure when / how long ago it was unplugged. Could be recent, could be a while back.
But when I do plug it in, it’s very noisy. A rapid clicking / ticking sound so am reluctant to plug it in for long u til I figure out what it is about.

Hope this description helps but happy to give more details.

Many thanks.
 

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