Whirling noise

Ok I know you all seen enough of this heading...
After reading so many comment on this noise I was like ok, I have a bad Fan Clutch... Well I replace it over the weekend ( about an hour ) and I started the truck... Still makeing same noise.....
To me it sounds like it is coming from the alternator... If is it going bad... could it make a like whirling noise?? This noise is coming from the driverside of the engine right around the alternator....

It is a '05 TB with about 45,000 miles the noise started about 4-5 months ago at the typical chevy squeek.... no more squeek, just whirling all this time...

Thanks
Scott

Loosen or remove the bett see if it goes away.

OK, and the best way to just loosen the belt???

try the idler pulley....use a long screwdriver on bolt head attaching pulley with engine running(being VERY careful)...you should hear the rattle/grating noise through the handle. kinda common on those. if you buy the pulley and it has a bracket on it, just change the pulley, so much easier. let us know!