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  #1  
Old 09-18-2016, 09:06 PM
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fan clutch question-1999 e300d

when the car is cold should the fan spin freely or be hard/impossible to turn? i've always thought that the fan was free-wheeling until the temp was achieved for the clutch to lock up and make the fan spin.

thanks in advance

g

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  #2  
Old 09-18-2016, 10:40 PM
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I have a '98 E300, which I think has the same fan clutch as your car. I recently put a new one in.

When the motor of my car is not running. the motor is cold, and I face the car from the front, I can turn the fan clockwise with my finger but there is some resistance and the fan stops immediately when I take my finger from the fan blade. The fan definitely does not spin. I think that is what is supposed to if the fan clutch is working properly. (I have not tried to turn the fan counterclockwise.)

When the motor is cold and running, you should be able to stop the fan from the driver's side with a rolled up section of a newspaper as the clutch has not yet engaged.
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Old 09-19-2016, 05:14 AM
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grab your fan blades see if any play by wiggling it.If so replace.
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Old 09-19-2016, 03:24 PM
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with engine off the fan will be slightly hard to rotate, when you start it up, the fan will roar as it will act engaged because the silicone oil inside pools to one side of the clutch (making it heavy)

once the oil is spread out the fan will freewheel and you can stop it with your fingers easily - it will be quiet and wont instantly speed up with engine rpm either.
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Old 09-20-2016, 09:45 AM
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Zulfiqar is exactly right.

-J

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