Here are the best places to look:
* Repair Manual: A factory service manual (FSM) for your specific year and engine will have the most accurate and detailed vacuum diagram. These can be purchased online from places like eBay, Amazon, or specialty auto parts websites. They're usually the best investment if you plan to work on your van regularly.
* Online Forums: Websites and forums dedicated to Dodge Ram vans (like RamchargerCentral.com, for example, though you may need to search for a specific forum) often have members who have scanned or photographed their vacuum diagrams and are willing to share them. Search within the forums using your year, model, and engine size. Be aware that the quality and accuracy might vary.
* Haynes or Chilton Repair Manuals: These are less expensive alternatives to factory manuals, but the diagrams may be less detailed or accurate.
* Auto Parts Stores: Some auto parts stores (like AutoZone, Advance Auto Parts, or NAPA) might have access to vacuum diagrams through their computer systems if you provide them with your vehicle's information. Your success here may vary.
Important Considerations:
* Engine Size: Specify your engine's displacement (e.g., 3.9L, 5.2L, 5.9L) when searching. The vacuum system will vary significantly between engines.
* Transmission: The transmission type (automatic or manual) might also slightly affect some vacuum lines.
* Options: Features like air conditioning or cruise control will impact the complexity of the vacuum system.
Remember to always disconnect the negative battery terminal before working on any vacuum lines to avoid electrical shocks or accidental damage.
