The M103 uses a normal viscous fan clutch, non locking. Basically once you hit 2000+ RPM the clutch is over taken and slips totally, it can only spin that fast. Too see if the clutch is still working you need only warm engine up to 100 and it should be fully engaged and spinning at engine speed. Not free wheeling. You can then rev the engine and see if the speed increases forcing more air until you pass 2000 RPM where it will basically just be free wheeling pretty damn quickly. If the fan does not spin faster as you rev the engine than it is most likely the clutch that is dead. This is not a full lock magnetic clutch like on the M102. You can also shut the engine off at 100 degrees and try to spin the fan, if there is resistance then the clutch is at least partially working, if you can spin it with one finger and it keeps going then clutch is most likely dead.

A news paper rolled up and tap the top of the fan will accomplish the same thing as grabbing it but with less of a possibility of finger tip loss.

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....