I'll make a couple comments here but realize I have never changed one on the W124 diesel - just the W124 with the 104 engine. You can remove/replace the fan clutch on the 104 without removing the radiator. The hardest part is "locking" in the clutch mechanism. You have to have a "special" locking tool which can be fabricated using a straight piece of round stock bent on the end. Do a search and you will find alot of discussion.

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Jim