Some fan clutch would start noisy as it is engaged and then frees itself until the coolant temperature reaches a certain temperature to engage the clutch.
When the fan clutch is engaged, the noise from it would be louder but it should not be all the time as it is supposed to freewheel slightly when the coolant temperature is not too hot to engage the clutch to a direct drive.
Get a second opinion if possible.
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Thursday, June 30th, 2011 AT 2:01 PM