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Are you talking about the "idler pulley"? They are quite simple to change. Loosen the serpentine belt by using a socket on the center of the tensioner pulley, slide the belt off the idler pulley, use a socket to pull the center bolt of the idler pulley and replace the pulley with a new one.

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Q: What is the pulley under the alternator in a 1994 Chevy caprice 5.7L and how hard is it to change?
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