squeeling sound after installing new belt usually means that the belt is not tight enuff. if that is not the cause, a bearing on a pully wheel may be bad
Replace the belt.
PUT A NEW BELT ON IT
Adjust the belt or replace it with a new one.
If changing the belt and tension pulley did not resolve the high-pitched squealing sound, it could be a sign of a failing alternator, idler pulley, or a loose accessory pulley. I recommend having a mechanic inspect these components to identify and fix the issue.
Either it's too loose or you need a new belt.
It could be a bearing in an idler pulley.
To fix a squealing belt in a 2007 Hyundai Elantra, first, inspect the serpentine belt for signs of wear, cracks, or damage. If it's worn, replace it with a new one. Additionally, check the belt tensioner and pulleys for proper alignment and function; if they are faulty, they may need to be replaced or adjusted. Finally, ensure that any oil or coolant leaks are addressed, as these can contribute to belt slipping and squealing.
When a car makes a whining sound when accelerating, it might be a fan belt that is not performing properly. If the fan belt is reasonably new, add a few drops of dish soap to the inside to quiet it. If the fan belt is showing signs of wear, like cracks or slack, put on a new fan belt. Also, check the air cleaner. If the air cleaner is missing, the car will make a horrible squealing noise when accelerating.
Installing a AC belt on a Hyundia Swell is simple. All you have to do unbolt the old belt and replace it with the new one.
Are there other accessories driven off the same belt? If so check them out. And you didn't mention if you replaced the belt tensioner or not. If not check that out also.
squeeling usually means you need a new serpintime belt or one of the belt pulleys has a bad bearing check the belt tensioner first you will need to remove belt from this pulley to check it
It sounds like you need a new serpentine fan belt.