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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
bad pulley bearing or the AC clutch. If you have a long screwdriver or a pry-bar of some sorts, place the tip on the nearest non-moving part of each accessory/idler etc.. and place your ear to the other end of the bar you are using.
You will be able to hear, plain as day, through the bar, when you have found the culprit.