To find it, you'll need to consult a repair manual specific to your van's engine. These manuals will have diagrams and detailed explanations. You can often find these manuals online (some are free, others for purchase) or at auto parts stores.
General searching tips: When searching online, use terms like "2000 Dodge Ram Van [engine size] EGR valve location" (replacing "[engine size]" with your engine's displacement, e.g., "5.2L"). Pictures and videos showing the location are often available.
Caution: Working on the EGR system can be messy due to potential carbon buildup. Be prepared for this and take appropriate safety measures.