Main System
WARNING: This page is about a different car, the 1995 Ford Aerostar. However, it is still accessible from the selected car via links, so may be relevant.
The main system operates by drawing in outside air or recirculating interior air, depending on function selector knob position. The 4-position blower speed switch uses a triple voltage dropping resistor assembly. Blower motor can be turned off only by placing function selector knob in OFF position.