I just did my plenum fix and now my heaters are defaulted to defrost and my cruise control doesn't work. All the vacuum lines are connected correctly and none are broken. both my cruise control and all vents worked before i did the plenum. what happened???

 

Stuck check valve? Obstructed line? All nipples vacated capped on the intake?

 

not sure about the check valve or obstructed line. everything is attached and there is vacuum at the second "T" fitting. my vents and cruise worked for about a half hour after i did the plenum then it just stopped.

 

Sounds like a plastic tube is broken somewhere. If it worked before, there is no reason it shouldn't work now. And here is a good thread to read. https://dodgeforum.com/forum/2nd-gen...ild-vents.html