Before you replace the compressor pull the fan and go in there with a good flash light and check that there is a gap between the clutch and the pulley. Or remove the belt and try spinning the pulley and see if the clutch spins with it. It could be that just the clutch is stuck and the compressor behind it is fine. Its a lot easier/cheaper to replace a clutch instead of a compressor. The clutch thermal fuse is a weak point in the system and can fail at any time even if the compressor is fine. Also from my experience it takes a lot more force to spin a w210 compressor than a w124 compressor. It's a completely different design.

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CENSORED due to not family friendly words