* Online Repair Manuals: Sites like Mitchell OnDemand5, AllDataDIY, and ChiltonDIY offer detailed repair information, including vacuum diagrams, for a fee. These are often considered the most reliable sources. The subscription usually covers a range of years and models.
* Factory Service Manual: This is the best source but often the hardest to obtain. You might find a used copy on eBay or Amazon, but they can be pricey. These manuals are created by the manufacturer (Dodge/Chrysler in this case) and contain highly detailed information.
* Online Forums: Search forums dedicated to Dodge Ram vans (e.g., on sites like DodgeForum.com or RamForum.com). Someone might have already posted a diagram or know where to find one. Be prepared to search using specific terms related to your engine and system (e.g., "1999 Dodge Ram Van 5.2L vacuum diagram").
* Local Auto Parts Store: Some auto parts stores (like AutoZone, Advance Auto Parts, or NAPA) might have access to diagrams through their computer systems. It's worth checking, but they may not have the level of detail you find in professional repair manuals.
Important Note: When working with vacuum lines, be extremely careful. Incorrect routing can lead to serious drivability issues and even damage to your engine. If you're not comfortable working on your vehicle's vacuum system, it's best to seek help from a qualified mechanic.
