* Online Parts Websites: Sites like AutoZone, Advance Auto Parts, and RockAuto often have diagrams available *if* you can find the correct engine for your van. You'll need to know your engine's displacement (e.g., 318, 360 cubic inches) and potentially the engine code (found on a sticker or stamped on the engine block). Search for your specific engine and look for "vacuum diagram" or "vacuum hose routing." Keep in mind that these diagrams are often simplified and may not show every single connection.
* Haynes or Chilton Repair Manuals: These manuals are often available at auto parts stores or online retailers. They usually contain detailed vacuum diagrams. Make sure you get the one specifically for your year, make, model, and engine.
* Factory Service Manual: This is the most comprehensive source but also the most expensive. It might be available through online retailers specializing in automotive manuals, or potentially through a Dodge parts dealer (though availability will be limited).
* Online Forums: Searching on forums dedicated to Dodge Ram vans (or Mopar vehicles in general) might turn up someone who has a diagram they're willing to share. Be prepared to provide details about your engine. However, treat information found on forums with caution, verify information from multiple sources.
Important Considerations:
* Engine: The vacuum system is highly dependent on the engine. Knowing the exact engine is crucial.
* Diagram Accuracy: Older diagrams might not be perfectly accurate due to variations in production, aftermarket modifications, and wear. Use your best judgment and visual inspection to verify connections.
* Safety: Working with a vacuum system requires careful attention. Incorrect routing can cause engine problems or safety hazards.
Start with the online parts websites, providing the engine details. If that doesn't yield a result, invest in a Haynes or Chilton manual – it's a much better investment for various maintenance needs beyond just the vacuum diagram.
