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To change the serpentine belt on a 2004 Trailblazer, first, ensure the engine is off and cool. Locate the tensioner pulley and use a wrench to rotate it counterclockwise, which will relieve tension on the belt. Remove the old belt from the pulleys, then route the new belt according to the belt diagram usually found on a sticker under the hood. Finally, reapply tension by releasing the tensioner and double-check that the belt is properly aligned on all pulleys.

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4d ago

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