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The rattling when on is likely loose fan blade bolts. Mine made the exact sound you describe when activated. My fan bolts were rusted snug, but after breaking them loose, giving them some lube, and then retorquing them, the rattle went away. Suggest same to others. Break loose, retighten...

Disagree. On my 925A2, my fan does not spin at all when the engine is running, until called upon, then it sounds like a hurricane under the hood front. I think the bearings or springs are going bad in any air clutch fan that spins when not called upon. Also check for an air gap at the clutch...