Engine rattling noise issue. Can someone tell me what is making this noise?

Facebook video does not play for me. Without being able to hear it I speculate it may be one of the accessory belt pullys.

There is a belt tensioner and a separate idler pully and there is a bearing in the AC clutch that can all make noise at idle.

If it is one of them you do not want a failure to throw the accessory belt, because your water pump is driven by that belt. If it stops, you quickly overheat and damage your engine.
 
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