Hi can anyone help.I have a 2005 2.7 sed. The heating is stuck on hot but when I try it in dual the passenger side gets cool but the drivers side stays hot any ideas thanks ????????

 

Don't know beans about the diesel offerings, but if it has one, sounds like your DCCV is knackered, or it has besmirched your climate control module, or both. A search on "DCCV" or "blows hot" will probably reveal a week's worth of research reading, if not more.