I read about MB fan clutches sometime ago but I can't find the source. Something like when you start a dead cold engine the fan kicks in for a few seconds until the fluid distributes then it freewheels. Eventually the engine gets hot enough for the fan to engage again. There's a minimum looseness to the fan. Even in freewheeling mode it will spin only so much when you shut off the engine. If you shut off the engine with the gauge showing 115*C then the fan will pretty much stop with the engine.
Sixto
... stay tuned
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