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Well, I certainly wouldn't recommend using the fingers on a running engine.
But I certainly hope you're not going to go sticking a rolled-up newspaper in there while it's running, either! That's just asking for trouble.
You need to spin the fan when the car is cold - and not running.
I don't know the exact threshold, but I don't think it should make a full revolution on it's own. It should only make a 1/2 or 3/4s of a revolution.
Paul
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