My apologies for the delayed response.
I am going back to answer - unanswered questions. I have only been on this site for the past 4-months. Questions Posted have exploded (+55%) since joining.
I do not know if you still need this information, but I am answering it either way.
CLICK on the following LINK. It has the Serpentine Belt Diagram you will need.
If you would: Before Clicking: Let me know if this helped you, or if you have any additional information or questions. Feel Free to contact me at FixYa.com
Again my sincerest apologies...
Thanks!
http://www.2carpros.com/car_repair_information/year/2003/make/mitsubishi/model/montero/2003_mitsubishi_montero_drive_belt_routing_diagram.htm
SOURCE: serpentine belt diagram
Go to this link:
http://www.mvreader.com/multiview/dayco/index.php?bgInterchange=1&l=n
Enter your vehicle information. Then click on Belt Routing Diagram, It will pull up a picture of the diagram.
SOURCE: serpentine belt diagram:
The belt routing diagram is located on the top radiator cross member by the hood latch. You should see it when you open the hood. If it is not there, all Chrysler, Dodge, and Plymouth minivans, from 1993 to at least 1999, used the same 3.3L engine setup, so find someone with one and look for the diagram where I described.
SOURCE: serpentine belt diagram:
if yours has the 3.8L then here is the diagram. Hope this helps
~ Zach
SOURCE: serpentine belt diagram
The serpentine belt routing should be labeled on your radiator shroud. Look around the engine compartment like the hood or radiator fram suport and there should be a label with the the belt routing.
Good luck and hope this helps
Below is the master help link
provided to go through belt routing diagram:---Timing belt, drive belt,
serpentine belt, accessory belt, fan belt, engine belt routing diagrams for all
types of car models?
Click the link below: ----
http://carbeltrouting.blogspot.in/2012/02/timing-beltdrive-beltserpentine.html
----------This will help. Thanks.
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hope this helps 
Did you check for a diagram under the hood?
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