Where is location of vacuum check valve on 1999 Dodge B1500 Van?

There isn't a single "vacuum check valve" on a 1999 Dodge B1500 van. The vacuum system uses numerous check valves integrated into various components throughout the engine bay and under the van. These valves control vacuum to different systems like the brake booster, HVAC system, and transmission (if applicable). They aren't usually standalone components easily identifiable as a "check valve."

To find a specific vacuum check valve, you'll need to know which system's vacuum you're investigating. For example:

* Brake Booster: The check valve is typically integrated *within* the brake booster itself. You won't find a separate valve.

* HVAC System: Check valves might be within the HVAC control module or in lines running to the actuators. These are often difficult to isolate without a detailed vacuum diagram.

* Transmission: If your van has vacuum-controlled transmission components, the check valves would be part of those systems, typically integrated and not easily identifiable.

To locate a problem:

1. Diagnose the problem: Determine which system is malfunctioning due to a suspected vacuum leak. Is the brake booster weak? Is the HVAC not working correctly? This will narrow your search.

2. Consult a repair manual: A factory service manual for your specific 1999 Dodge B1500 van is invaluable. It will contain vacuum diagrams showing the routing of lines and the location of various components.

3. Inspect vacuum lines: Visually inspect all vacuum lines for cracks, holes, or loose connections. These are far more common causes of vacuum problems than failed check valves.

Without knowing the specific vacuum system you are troubleshooting, it's impossible to pinpoint the location of a particular check valve. Use the steps above to narrow down your search.