Dodge 2005 Neon Owner's Manual page 107

In cold weather, the use of the Recirculate position will
cause windows to fog on the inside because of moisture
build up inside the vehicle. For maximum defogging,
select the Outside Air position.
If the mode control is in the range between Mix and
Defrost and you choose the Recirculate mode, the mode
control knob will automatically move to the Mix position.
UNDERSTANDING YOUR INSTRUMENT PANEL 107
NOTE: If you choose either the Mix or Defrost modes
and the Circulation control is in the Recirculate Mode, the
system will automatically switch to the Outside Air
position.
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