I'm new to any forums hope I can find a gear head that can help.
My 2010 2.4l accord Lx is squeaky or more like a chirp, i originally thought it was the alternator because it sounds like that area and placing my hand on the back of it I can feel a grind that seems like it corresponds with the chirp.
I took it apart cleaned it both barrings seemed fine Hooke a drill up to it no chirp put it In and there it was again, so I bought a re manufactured same problem, thought I got a faulty one so I got another same problem, four machanics thought it was the alternator.
Then I replaced the belt, and tensionor barring same thing, I checked all the pullys while I had belt off many time all seemed fine.
It stays constant while Rpms are up or down, but sometimes it will stop all together for minutes at a time ac on or off don't Change same with turning the wheel or using more electronics, the temperature is the same it has always been. If anything it's more **** to slow down with rpms. After I changed the belt it did seem to change a little it will stop more often, and if you leave it at idli for awhile it will stop or almost stop.
Can someone please help

 

It will go from vary loud to a softer tone or even down to almost nothing at all

 

A misaligned pulley can cause a chirp. Also water pump bearing can make a chirp.

Suggest starting w/ serpentine belt removed to confirm that a belt driven component is source of noise.

good luck