Fan belt squeaks, changed belt @ tension & idler pulleys still squeals

When I have had trouble with V-belts squeal or serpentine belts the belt is loose need to adjust tension or tension pulley bad. Belt wore and needs replacing or some of the pulleys are dragging while rotating or turning, could be bearing for pulley going bad.
Check belt is tight, look of high wear a lot of cracks in the belt. You can try loosening the belt and turning the pulley which will turn and see if they odd sounds or stiff to turn.
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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

Check these......................


Diagnosing Belt Noise squeak or squeal on Serpentine Belt

How to Fix Squeaky Belt figure out where the squeak is coming from

Did you replace the belt tensioner

yes, if it is frozen up the belt will squeal and burn up ! you can go to any auto parts store and tell them you need a idler pulley for your vehicle. good-day !

Has it just started with cold weather? Does it squeal at first then as the engine is revved, stop squealing.

If so its probably your alternator belt has worked loose and needs tightening. I'd check this out first, if you've not done it before ask a friend with some know how for guidance. But as a guide, there should be about an inch of give when flexed on the longest run between 2 pulleys, if more then probably needs tightening. If more than a couple of years old, replace with a new one.

If it still squeals after tightening/replacing, you could have a faulty water pump bearing or pulley bearing. Either would require replacement to pre-empt catastrophic failure and resultant engine damage.

The bearings in the fan clutch, or idler pulley may be going out, which would create extra resistance. This would cause the belt to squeal until everything is moving like it should. Try to lube the bearings, and put some belt stop squeal spray on the belt ridges. If this doesn't help, take the belt off and find which pulley is causing the extra resistance.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

No, The fan clutch will not make a Noise it will just not catch the Fan to Cool. It is the Belt. Make sure that it is Tight. You may have a Bad Belt Tensioner if it is not.

Belts stretch from new. Try to tighten them again. Hopefully the are not glazed or this may stay with you.

The noise is most likely the serpentine belt. Check it's condition and that of the belt tensioner. It sounds like the belt is slipping, causing the squealing noise u describe. As the belt warms up, it's getting a better 'grip' and the noise stops. Turning on the heat also turns on the a/c in newer cars, this added drag on the belt (one more component to turn, the a/c compressor) would explain why it happens when u turn on the heat. Is the belt original? If yes, it's time to change it, and check the belt tensioner to make sure it's doing it's job of keeping the belt snug on all the pulleys. Let me know how u make out.