I need a picture or diagram of a 1994 Cadillac DeVille 2 door 4.6 Ltr Serpintine Belt

You can sometimes find these online, but a lot of the time the diagrams from the internet are listed under the wrong year or model of car. The easiest way to be sure you have the correct diagrams for your car is to buy a Haynes manual for it. These have all of the diagrams that you will need, as well as specific directions and helpful hints about doing the work yourself, and checking your work for accuracy. In the future, you will also find that the Haynes manual is great for diagnosing and resolving other issues you may have with your car. It is written by mechanics, based on a total tear down and rebuild of the car, and includes lists of common problems and fixes, engine schematics and diagrams, and step-by-step instructions on how to diagnose and repair every stock part on your car. I have not been without one in 10+ years that I have owned and been working on my own cars.
Haynes manuals are available at most auto-parts stores and some larger bookstores. They are specific to the make and model and year of your car, so the information is always spot-on.

Hi, the diagram might be in the engine compartment, maybe the underside of hood, but if not able to see it go to www.accessdayco.com , click on auto/light truck, enter car info, click on serpentine routing.