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Originally Posted by Ralph69220d
Viscuous drive clutch fans will spin at close to the speed of the pulley when the fan is cool (engine hasn't run for a while) at idle. I believe this is due to the media (some silicone like compound) being cool and there is some settling of the media if the vehicle sits even overnight.
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The 107 manual claims that it operates at approximately 1/2 speed. I've been toying with buying or making an infrared RPM meter to verify this.
With all the trouble (and expense) these clutches cause, you wonder why no one has made a hub for a flex fan blade to bolt on to (well, it's definitely going to be noisier, and chopping a finger off if you stick it in the moving blade is just about guaranteed). Maybe liability?