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I reckon the first thing I would check is the crankcase oil level. If it was OK, I'd poke around the belt driven accessories with a homemade stethoscope, to make sure one of them wasn't acting up.
You may wish to make a recording and post it for us to listen to.
Maybe take it into a shop or dealership and have another set of ears give a listen.
What's the last thing that you did mechanically to your car?
Good luck.
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