Can anyone post a diagram or a picture of their vacuum system. I think my truck has an issue which is causing the vents not to change over and to heat or cool. I just don't know if I'm missing a vacuum line or if it's disconnected?

I've got a 2001 Dodge RAM CTD.

 

go to the 2nd gen forum and at the top of the forum is a "merry christmas" link... download the manual, it'll have everything you need...