kia sedona 2002 3.5 lt serpentine belt how to take tension o

there is a speciality tool actually to take the tension of this belt . You can also do it the "old fashioned way" and alow only 1/2 inch of play with moderate pressue at the longest part of the belt(between the compressor and the crank pulley if I remember correctly)
If you experiencing some kind of problem like noise or altinator not charging bring it back to the dealer their are a few "bulletins" or "improvements I've heard about for these problems.

under the pully is a bolt, and then losen the nut on the pully the bolt on the bottom will make the pully go up and down. thats how you do it