This video describes how to investigate and fix the cause of a squealing sound made near the belt of a car engine. Two examples of this repair are shown.
This is an amateur demonstration, offered in good faith for free but with no guarantees as to accuracy or safety. Auto repair is inherently dangerous, and especially risky when working around moving equipment. Be sure to control loose clothing, hair, and anything else that could get caught in a moving belt. Always be aware of your personal safety, wear safety glasses. Any misadventure you encounter if you decide to accept this risk and repair your vehicle is your responsibility.