I have replaced the belt, belt tensioner, idler pully, and still i have this noise.
im 90% sure its also not the AC compressor, so what is this? The noise does seem to be centraly located, so does the fan assembly have a bearing?
If i spray some WD40 in that aera the noise stops for 30-40 seconds but who knows what the spray is contacting to make it stop. I feel like it has to be a bearing someplace because of the WD40 being able to short term stop the noise.

 

BTW I am revving up the engine with my hand to create the squeak in the video.

 

I`ll be honest I dont know ! It sounds like the air con pull the plug and disconnect it.If it doesnt make the noise anymore then you found your problem.

 

To me, It sounds like a loose nut somewhere. Like one of the pulleys is loose and vibrating when you rev it up. Hard to tell from a video tho.