Need a diagram of how the serpintine belt runs on a pontiac grand prix gt 3800 series

If it a serpintine belt (meaning one belt runs everything) and it comes off on its own its time for a new belt to install new or reinstall old one . All cars have abelt routing diagram if not google your car and year asking for belt diagram. Locate tensioner usually turns with wrench ( socket or box end is best) route the belt according to dia. leave tensioner for last rotate pully with wrench to get belt over release tension on wrench thats all there is to it. But if belt keeps coming off usually indicates new belt is needed could also need tensioner pully its a good idea to replace both at the same time

http://www.2carpros.com/diagrams/pontiac/grand-prix/1998 Look no more,click on link to see super charger belt route.

Timing belt routing diagrams for cars and trucks? Click the link below:--- http://technoanswers.blogspot.com/2011/10/timing-belt-routing-diagrams-for-cars.html

Drive belt routing diagrams for cars and trucks? Click this link below:--- http://technoanswers.blogspot.com/2011/10/drive-belt-routing-diagrams-for-cars.html

Go to this link and you will find the diagram your lookiing for. Count the belt contact points(pully) and notice where they are. http://www.paulstravelpictures.com/GM-Pontiac-Grand-Prix-Serpentine-Belt-Replacement-Guide/GM-3800-II-Serpentine-Belt-Replacement-Guide-003.html

http://autorepair.about.com/library/graphics42161843.gif

here is the link to a diagram hope this helps you out

Here you go!

2004 PONTIAC GRAND PRIX 3.8 LITRE V6 SERPENTINE BELT

Go to the following web site (copy and post the web address to your browser)
http://www.daycoproducts.com/daycoweb.nsf/cf652a4feb630ad0862571a4005ae40c/a866a821123f887c862571a5006988df!OpenDocument

There are 2 PDF documents above the photo. The first gives you theRouting guide for the vehicle/engine - 6-24 - on pages 103/104 of the PDF doc and the second document ( Illustration PDF) gives you the belt routing diagram for 6-24.

Hope this gives you what you need.
Cheers
Sean
Voluntary contributor.

Diagram

Here ya go:

If you have the 3800 Series II or Series III engine, this should help you out.

If you dont have the supercharger, just disregard the belt routing with the S/C on it.

http://img.photobucket.com/albums/v249/KCPM/Board%20images/tutorials/CamSwap01.jpg