1988 190e - motors seemed dead - no movement. The regulator looks very similar to the 124. I removed the unit - tight but was able to get it out. Unit disassembly was staight forward (remove metal cover plate to expose the cranking mechanism). There was rust on the drive shaft of the motor and after cleaning / lubing, I got both the left and right back in working order.

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07 E350 4Matic wagon, 06 S430 4Matic, 99 SLK 230
retired W210 (x3), W124, W126