Bearing in AC gone bad?

[mendenhall2]

Hello all,

I have a 1983 300D, and I've just developed a loud squeaking noise when the AC is on. It goes away as soon as I hit the Economy button, so I think it's the compressor itself, and not the blower. The PO included some service records showing that the compressor was replaced in May of 2019, so I'm wondering if there's some bearing somewhere that needs replaced after ~37 years. The AC still blows cold, but I don't want to break anything, and I don't want to listen to the squeak haha

I looked at the manual to replace an electromagnetic clutch in the AC system, but I don't know if that's right. https://www.tonk.ca/models/w123/w123CD2/Program/Climate/83-256.pdf

Anybody have any wisdom they could lend me for this?