I did a complete pod replacement along with the evap on my 260E 2 years ago so I'm familiar with what needs to be done.
In fact, my dash is cracked, so its on the list to replace it anyway. I don't want to touch the evaporator this time though. The evaporator has no signs of leaking, so I see no reason to touch it. I remember I got the dash off in about 2hrs first time around.
From -->
http://w124-zone.com/downloads/MB%20CD/W124/w124CD1/Program/Climate/83-620.pdf
1: Recirculation Air Flap <-- dead
2: Recirculation Air Flap <-- dead
3: Footwell Flaps <-- GOOD (and I know they work anyway...)
4: Center Nozzle Flap <-- almost dead?
5: Defroster <-- GOOD
6: Diverter <-- dead
7: Defroster <-- dead
So yep, looks like I am getting hot air into the cabin at all times right?