Auxiliary Blower
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.
Auxiliary heater unit has an additional blower speed control switch located in line with second row of seats. Switch is operational only when blower control switch on instrument panel is in REAR CTRL position. See Figure. Rear blower speed control switch is overridden when instrument panel switch is in any other position.
The auxiliary blower switch has 4 auxiliary blower motor speeds. When front selector switch is in OFF position, auxiliary unit is also off.