George Murphy sells rebuilt servos and amplifiers, and vacuum diaphragms. IIRC, a rebuilt amp from him is around $100.

Used working ones are $30 shipped on ebay. Search "Mercedes climate amplifier" to find them.



They look like this.

I had to deal with fixing the servo climate control system, and it completely works (it's nice!) so if you need help feel free to ask me. There is a learning curve on ACC work, particularly the older version.

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1980 240d
1999 SL500