Weird noise from engine bay

[Kristoi]

Hi, ever since my AC compressor seized ive been getting this weird noise from engine bay, looking closely i can see the tensioner moving a bit when the sound occurs. I changed the pulleys but that did not fix the problem. It seems to be making that sound only with warm engine. Waterpump was changed 3 months ago. Could a bad tensioner arm make that kind of sound? 

 

 

[Texas]

Deffo a bit suspect, but I would remove belt and check smoothness of all pulleys in system and then run engine ( for short time only as no water pump or alt will be operational) with the belt removed, this will indicate if the noise is indeed in the aux  belt system or not.

so, you say ac seized. So do you now have replacement good ac compressor? If yes then when old compressor failed it may have put a lot of force through the tensioner and damaged it to how it is now ( if it is tensioner)

[VFR]

Sounds & looks like a worn bearing IMO.