Hello,
I'm trying to figure out my wild vent issue on my old beater truck. I have 2001 Ram 1500 5.2L 4 X 4. My vent has been stuck in the defualt positions for about a 1 year. I've read a lot of the post on wild vent issues. I just installed a check value and I noticed a missing/broken vacuum line and I have no idea where it should run to. I don't see anything hang on that side of the truck. Where does the circled vacuum line connect to? I assume the X lines runs to the vent? Thanks in advance for you help.

 

My guess would be behind the dash. I am going through similar issue where I only have defrost working. I am in the process of getting the final top part of dash. I have the complete front main, bezel and next the top. I can then do everything at once. Since it's a hard plastic line that broke somewhere behind the dash so when I drop it down, I can run through all the lines and fix what I need. LMC is having a staffing shortage as well so who knows how long it will take once I can order the dash to get it? I will take some pictures one I open it up. I have a 1999 Dodge ram 1500 5.2.

 

X runs to the reservoir, O is the line going into the dash and the line in front of the CV is for the cruise control. This pic is for the TSB that was for the earlier trucks that didn't have the second check valve. You have the large one so it shouldn't be an issue. If it is put a another check valve on the O line. Also make sure you have the check valve installed the correct way(it needs to hold vac towards the O line).

 

What is the check valve between motor and fire wall? Seems to go down to tranny. 97 1500

 

Is your truck a 4x4? If it is, then those lines are likely for the transfer case, and central axle disconnect.

 

it is 4x4

 

Should be a white, and green line heading down there. White is vacuum supply for the CAD, green is just a vent line, doesn't hook to anything up top.