I need the serpentine belt diagram for a chevy Express Van

you did not specify what engine.
google 2009 chevy impala serpentine belt Diagram


copy and paste

https://www.justanswer.com/chevy/3ruw6-need-serpentine-belt-diagram-2006-chevy-3-5-lt.html

https://www.fixya.com/cars/t15630016-diagram_serpentine_belt_2009_impala_3_5l

When I bought a new belt for my Jeep, the Auto-parts store furnished me a diagram, specific for my vehicle, and how it is equipped (air cond. etc.)
I dealt with NAPA auto parts, but any good parts store in your area should do.
You may also be able to find one online.

Hi, go to www.accessdayco.com click auto/light truck, enter van info, click serpentine routing.

Alternator

Okay, there are a few engines that come in this van, lucky there the same except,they come with or without ac or airpump, so i will give you all of them and you choose the right one.

for the most part you use a breaker bar lift up or push down on the belt tension and remove the belt and do the same thing to put the new one on and there should be a belt diagram under the hood if not give this website a try www.webcrawler.com Merry Christmas and Happy New Year as alway wish you the best of luck Michigan Man.

My sincere apologies for the delayed response.
I am personally going back to answer your unanswered questions.

I do not know if you still need this information, but I am going ahead and answering it anyway. You may want to Print the Diagrams for future use.

I am assuming this "van" is a Chevy Venture?
CLICK on the following LINK. It has the Belt Diagrams 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 apologies...
http://www.2carpros.com/car_repair_information/year/2000/make/chevrolet/model/venture/2000_chevrolet_venture_drive_belt_routing_diagram.htm

i have a 2000 Chevy van where is the fuse for the two(2) rear power outlets