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What fan belt? Fiero fans were up front while the engines were in back. You must mean the drive belt located in the engine compartment also known as the alternator belt. The adjusting bolt is located under a triangular plastic cap on top of the right wheel housing. Remove this cap and you will see the bolt down inside. It is not easy to get at and a long ratcheting type of wrench is best to use here. (not sure of the size, maybe someone else might know) loosen the bolt and slide the alternater toward the engine and remove the belt. Replace with a new belt and tighten by prying on the pry section (sorry, don't know how to better describe it) of the alternator; don't pry on the aluminum housing of the alternator. While holding the correct tension, tighten the adjusting bolt and replace the triangular plastic cap. Hope that helps. Good luck!
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