Chirping, squealing noise from pulleys

Pulleys also wear.
You've changed the belts - a workshop would then change that particular pulley, if asked to do so.

Start your engine, then put a few drops of water onto that pulley. Does the squealing noise disappear? If so, the pulley is slightly worn in the groove - and this happens to all vehicles.

Your option is to either replace that pulley or use a spray-on anti squeal compound.

Generic images below:
belt anti squeal Google Search

One of the accessory bearings could be going out
(I.E.-alternator,water pump,etc)If the noise is near an idler or tensioner pulley,it could also have a bad bearing.The best thing to do is remove the serpentine belt or release the tensioner pulley so the belt is loose,then you can spin each accessory pulley by hand and listen for the noise.You'll also feel the pulley dragging while you spin it and it might have a ratchety feel to it(in other words,as you're rotating the pulley you'll feel it spin somewhat freely and then it will feel as if its catching on something) If the belt itself is bad,it usually makes a squealing or chirping sound.If your vehicle has a vbelt drive with multiple belts,check the pullies the same way as described above and make sure the belts are all tight.A loose belt normally causes a squealing noise rather than a whining noise.Check your power steering fluid level too because the pump will whine if it gets low on fluid.

Replace the serpentine belt

Get an inexpensive mechanics stethoscope and put the end on the shaft part of idler pulleys, housing near bearings of alternator and water pump etc.
If that doesn't give clear results, try squirting a little water on the serpentine belt as if runs [a length of small drip irrigation hose works really well to get a little water on the belt]. The water will provide harmless temporary lubrication to the belt and change the sound if it is caused by the belt slipping.

i dont think is your harmonic balancer that dont make any sound check all the pulleys cose to change the harmonic ba... you havto remove and change your crank pulley along with it

Could be that the idler pulley bearing has failed (just replace the idler pulley) but first take a real close look all around the pulley looking for a very small piece of an old belt that has been burned onto it. If anything is on the pulley just clean it real good and the chirping may stop (real cheal fix).

Most chirping noises are due to bad pulleys on the motor. It's usuually an idler pulley or belt tensioner pulley. May also be the bearing in the alternator. Use a stethescope to check otherwise you can use a rubber hose. Put hose up to one ear and put other end by each pulley. Should hear high pitch chirping.

I have had alot of customers with this problem. There is another pulley called the idler pulley and alot of times its bad due to the bearing wearing out. I would replace that 1st for around $20

ok easy one for u take belt off and spin the alt pully to see if u hear noise or spin idler pulley to hear noise or any othe pulleys that should help u

You didn't mention the alternator, power steering pump, or water pump. In fact, any pulley other than the crankshaft one can have a bad bearing or dry seal. Remove the belt and spin each pulley while listening for any rough noise or squeal. If it was the crankshaft, it might be time to check the oil. Start the engine with the belt off to see if it does squeal. Make sure the noise isn't coming from the radiator fan(s).