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I think your engine has a fan clutch bearing bracket... these tend to go bad.
It's a bearing in a aluminium bracket that the main fan (between the rad and the block) and the fan clutch (on which the fan is mounted) are attached to.
This would be hard to listen to. With the engine off grab ahold of the fan clutch and try to move it front to back... any play would not be good. Also with the engine running try to look down at the pulley and see if it is making contact with the crank pulley below it... that's how mine failed and I could see a little fountain of metal shavings spraying up from where they were being ground off of the fan clutch pulley by the rubbing.
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