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I have a 2004 mustang, that is squealing, at first it was only for the first few minutes untill i started driving, it would go away. I bought some belt dressing, because an auto parts said the belt was fine. Now it is getting worse, almost all the time while I'am driving, It sounds like a pulley, but not sure, does anyone have an idea of what it could be?
 

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belt or belt tensioner but probably both and don't trust auto parts stores there not mechanics there just cashiers
 

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Could be the bearings in the pulley, but judging by the year, most likely not. I had an 87 Honda where the alternator belt would squeal. Check the tension on the belt. If its too loose or too tight, that could be ur problem.
 
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