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Originally Posted by uberwgn
DA, this all sounds correct. I changed mine a few weeks ago. Mine was locked up nearly all the time creating a ton of noise (drag). If the fan freewheels, it's shot.
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You mean the new fan clutch was nearly locked up all the time or are you talking about the old one? I found this post (the one at the top of the page) where the author states that MB designed the fan clutch to spin at half the engine speed up to about 90C at which temperature I suppose the clutch begins to go into a full couple.
fan clutch?
So I suppose even in "free-wheeling" mode, the fan isn't really supposed to free-wheel. Instead there should still be some drag to make it spin to some extent if I'm reading this correctly.
If anyone else has a new or fairly new fan clutch, I'd appreciate if you could do the same test that I did (spin the fan by hand with the engine hot and cold) and report your results here.