Idler pulleys can scream when they need to be replaced. Also you can test them by spinning them and listening, they should not make much noise if so replace them. To replace them you need fan tools, pry tool, ratchet and 13mm socket, and the new pulley. The removal of the fan and shroud has been explained in previous posts so if needed reread that. Once the fan and shroud has been removed undo the serpentine belt by relieving the tension on the pulley. Once removed spin the pulley by hand and listen if it is loud or had play it is bad. To replace this pop the plastic cover off and unscrew the bolt. Once removed slide the pulley off the bolt and slide the new pulley on. Make sure the notch is lined up with the raised notch on the back of the pulley. Tighten the pulley down and reassemble the belt, fan and shroud.
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