If your car has a noisy or squealing belt, it could be due to a number of issues. Here are some steps you can take to fix a noisy or squealing belt:
Check the belt tension. A belt that is too loose can cause noise and squealing. Consult your owner's manual to find the proper belt tension for your car. If the belt is too loose, you can try tightening it using the belt tensioner.
Check the belt for wear and damage. A belt that is worn or damaged can cause noise and squealing. If the belt is worn or damaged, it will need to be replaced.
Check the pulleys for wear and damage. Pulleys that are worn or damaged can cause noise and squealing. If the pulleys are worn or damaged, they will need to be replaced.
Check the belt for debris. Debris, such as dirt or rocks, can get stuck in the belt and cause noise and squealing. If you find debris in the belt, remove it and see if the noise goes away.
If you are unable to fix the noisy or squealing belt or are unsure of the cause, it is recommended to seek the help of a mechanic or a professional. They will be able to diagnose the issue and provide the necessary repairs.