Same chasis, same problem.

The vents are operated by vacum actuators that open/close the flaps inside the vents and when they fail, there is a default position: center vents flap stays closed, defroster stays open (security reasons) and recirculating stays off (no reciculating).

Fixing that is complicated because you need to remove the entire dash to replace the actuator for the central vents flap.

What I did is insert a pice of wood to keep the central vent flap open all the time. I get cold air but can't control the flaps anymore (I don't care because I have hot weather all year long).

There is a chance you have some isue with a 6 position vacum valve located under de glove box on the passenger side or a bad vacum hose. That's the easy part if you can find the leak. I didn't know how to find that valve in my car because mine has an airbag instead of a glovebox and I don't know how to manipulate airbags.

I hope this help.

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Juan
1995 E320 Sedan
2008 Ford Escape
RC Helicopter