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To replace the serpentine belt on a 1991 GMC van, first, ensure the engine is off and cool. Locate the serpentine belt routing diagram, usually found on a sticker under the hood. Use a wrench or ratchet to loosen the tensioner pulley, then slide the old belt off the pulleys. Install the new belt according to the routing diagram, ensuring it is properly seated on all pulleys, and then release the tensioner to secure the belt in place.

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1w ago

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