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Are you sure it's the clutch?
The scraping sound... sounds like the bearing bracket (bolts onto the block and holds the pulley that the fan clutch is attached to in place). In my case I found it because the pulley was rubbing against the crank pulley, squeling, and sending a tiny fountain of metal shavings upward from the area of the water pump.
Try to wiggle the fan (when its not running) back and forth... if it has a lot of play the bearing is shot. Even with a bad bearing the poly-V belt will hold it in place to a degree.
Good luck.
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