Your recirculation mode door is most likely broken. if you pull the blower motor out and look up in the housing you should see it laying over the inlet hole. or if you cant see it, you can reach up there and feel for it.
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The defrost position is the default for safety so that air always blows on the windshield in case of frost. The most common problem is a faulty blend door under the dash. In most cases the door must be calibrated with a scan tool if you replace it.
check for a loose or damaged vacuum line that controls the blend door-it could be under the hood (look on the intake manifold) or under the passenger side of the dash-it might also be the climate control unit itself, either a leaky vacuum line or an electrical connector that is loose.
from a TSB, wonder if your dash is cracked too? Symptom/Condition:
The condenser fan fuse (#39) in the power distribution center may open leaving
the condenser fan inoperative. This may be caused by a condenser fan with excessive
current draw or by water collecting in a trough in the fan shroud and freezing
in cold weather, which can prevent the fan from turning. This may illuminate
the Malfunction Indicator Light (MIL).
ps: the water collecting is because there is no protection in the underneath of stuff in these vehicles....many many documented problems, could be they originate from the cracked dash falling inside or pulling apart and damaging electronics too...