I have uploaded a few pictures from my disassembly of the dashboard and center console in my vehicle. In one of the photos, I have pointed out where all of the vacuum pods are located.

The dashboard cover is held in place only with six easily removed attachments (combination of three 4 mm allen key bolts on top, two 10 mm bolts on the botton left and right sides and a phillips head screw with bracket to the heater box itself).

I will probably have to wait a bit longer to remove the dashboard cover again to try to address the air flow issue. Because of the sharp edges of the dash cover, I have multiple small scratches on both of my hands and will probably wait at least another day.

There are two clips that hold the bowden cables in place under the center vents for the left and right vent slider controls. The middle slider has a completely different set up. Of course, they easily fell off when removing the dash cover, but I could not replace them despite trying. As a result, the sliders no longer move with ease, which may be inhibiting proper flow of heat in addition to other vacuum or electrical possibilities. Wondering if there is a trick to get the clips back into place other than brute force and cursing....

Attached Thumbnails

     

__________________
Brian
'94 E420 - 99K
'12 C300 4 Matic

Previously owned:
'06 CLK 500K Cabriolet
'85 300SD (Old Smokey)
2002 Boxster
2002 C320 (The five-pointed star Mercedes)
1993 300E 3.2 (Dealership's cash cow)
1979 300SD (Chrome beauty)
1983 300D (Old faithful)
1983 240D (Right lane cruiser)
1977 240D (Miracle of bondo)