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I have a 93 300TE (M104?) w/ 185K miles. I noticed an intermittent loud klunking/slapping noise coming from the engine compartment. Upon closer inspection, it appears the entire fan assembly/pulley is wobbling and is randomly interfering with an idler pulley in the fan's path. Is it the fan clutch? a pulley bearing? I'm not even sure what the actual configuration is on this engine, is the fan clutch attached to the water pump? or is it on its own dedicated pulley/bearing? Thanks in advance...
 

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About a dozen 1988, 1989, 1990, and 1991 sedans, wagons, 4Matics and 1 coupe
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With the miles your car has on it the problem is probably the fan idler bearing. The fan mounts to this thing, not the coolant pump. Stop driving NOW or expect to have the fan bore a hole in your radiator. I caught mine JUST in time. Another block and it would have been a disaster.

http://bos-engel.com/benz/failedidler.jpg

The fan bearing and support aren't expensive but the labor involved is substantial. It's a DIY job if you're pretty experienced.
I'm much more familiar with the M103 setup but the M104 is quite similar.
 
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