Well I just did mine a few nights ago (300se), and I did it without removing the fan clutch. Removed the fan blade, three 7mm (I think) hex bolts hold it in. Getting it off isn't a problem, but getting it back on took forever. It's hard to get the fan clutch off without the special Mercedes tool, I tried coat hangers, angled screwdrivers, nothing wanted to work. But once you can get passed the fan blade or fan clutch, it's pretty easy to do. Just make sure you get the routing correct. You might want to print up a pic of it to reference when you are under the car getting it around the tensioner, compressor, and crankshaft pulley. Also, compare the size of your old one with the new one before you start. Old one might up a tiny bit longer because of stretch, but that doesn't matter. If it's a half inch or more difference, you may have a problem.


Also, remember to loosen the 19mm bolt on the tensioner first, otherwise it's time for a new one.