Temperature Blend Door (Main System)
WARNING: This page is about a different car, the 2002 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.
Temperature blend door actuator is located on evaporator housing, below center duct. EATC module sends output signal to actuator to position temperature blend door. An internal potentiometer in actuator sends variable voltage back to EATC module to indicate door position.