The car is equipped with a V-belt. A serpentine belt is a long, flat belt with longitudinal serrations that snakes its way around all accessories, using both the inside and outside of the belt to bear against rotating surfaces.
Before you take any action, you need to find the true source of the noise. For example, I have worked with literally hundreds of AC compressors, and not one ever had a bearing noise. HOWEVER, very close to both the alternator and the AC compressor is the water pump, and they have a HABIT of creating interesting noises.
Before you take any action, you need to find the true source of the noise. For example, I have worked with literally hundreds of AC compressors, and not one ever had a bearing noise. HOWEVER, very close to both the alternator and the AC compressor is the water pump, and they have a HABIT of creating interesting noises.