How to diagnose and fix a continuous squealing noise in an Audi 80?

I have been hearing a high-pitched squealing noise coming from my Audi 80, and it seems to be getting worse. What could be causing this noise, and how can I fix it?

The most likely culprit for the squealing noise in your Audi 80 is a worn or damaged serpentine belt. This is the belt that connects and powers various components in your car, including the water pump, alternator, and power steering. If the belt is worn or damaged, it can start to make noise as it rotates. You can try tightening or replacing the belt to see if that resolves the issue.

Another possible cause of the squealing noise in your Audi 80 could be a worn or damaged pulley. The pulleys in your car's engine have bearings that can wear out over time, causing them to make noise as they rotate. You can check each pulley by hand and see if there is any play or grinding noise. If so, you may need to replace the faulty pulley to resolve the issue.