Blower Motor
WARNING: This page is about a different car, the 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, 2004 Ford Excursion, and 2004 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The auxiliary air conditioning system contains a blower motor which is controlled by the heater blower motor switch (18578) on the front or rear auxiliary A/C control.