How do you adjust the serpentine belt on a Kia Sephia?

It depends if you want to adjust the belt that does the a/c and Power Steering, or the one to the alternator. The power steering goes this way. First loosen the hex screw running through the power steering pump bracket. Then loosen the bracket hex screw that attaches to the belt tensioner bolt under the power steering pump. Then, tighten the tensioner hex screw that runs through the tensioner bracket. After you finish the adjustment, tighten all hex screws. If you adjust the belt for the alternator. You must loosen the alternator bracket hex screws on both the top and botom of the alternator. This requires going under the vehicle. Then, loosen the tensioner bracket hex screw and adjust the tensioner hex screw that runs through that. When you get the propper tension, tighten all screws and you are done.