Rear Air Conditioning in 2007 Doddge Caravan blowing warm air

Rear A/C not cold.  Traced it to the expansion valve or so I thought.  I changed the rear evaporator/expansion valve assembly with OEM from Mopar/Chrysler.  Initially, it appeared that I was getting the same temp from the rear as from the front.  But a day later, I am back to where I started.  Still no cold air is coming from the rear.  It is only ambient temperature or hot if I raise the temp control from Low to High.  The front is fine and is nice and cold and has been.   

Here is what I have accomplished
1. Van has auto temp controls, I used manual.
2. The rear lines are not pinched or broken.  I traced them to the mounting block on the front evaporator and the all the way back to the rear.
3. The system was evacuated and this created a vacuum.  Upon removing the lines to the rear evaporator, air entered the system as expected.    
4. I check the blend door, controls and motors and those are working just fine; both in auto and manual modes.  The blend door was tested multiple times.  No issues.
5. Motor speed control is also OK.
6.  After re-assembly, I had the system vacuumed and recharged.  No leaks.
7.  I can adjust the temp control to get heat from the rear heater core, but no cold air.  Only ambient.
8. The lines going to the rear evaporator are not cold,
9.  I reset the system by holding the Power and Recirculate buttons.

So, with the blend door and motor operating, why is the rear evaporator which is now new, not getting cold?  Could the one of the lines be blocked?  That is the only thing left that I can think of.    

What am I missing?