I found out by accident that my vacuum pump is now running all the time. It's not the gray line to the heater valve and it's not the vacuum canister as I already checked the easy stuff. I need some direction where to start looking under the dash as I have never been under that part of my truck. Any common issues or suggestions where to look?

More information: The pump only runs all the time when the HVAC control is set to OFF or MAX AC.

 

Hmm,
Fixed right?

Here are the files for other interested parties.


Sean

6.0L Tech Folder

 

Yes, fixed with some heat shrink tubing, but I didn't have those diagrams. Thanks for taking some time to find them for me.