Temperature Control Switch
WARNING: This page is about a different car, the 2005 Mercury Sable and 2005 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
The temperature control switch (19C733) is separately serviceable from the integrated control panel (ICP) (18C858). Temperature selection is accomplished with a potentiometer connected to the electric blend door. Movement of the temperature control switch from COOL (Blue) to WARM (Red) causes a corresponding movement of the temperature blend door.