Blower Motor Switch
WARNING: This page is about a different car, the 2008 Mercury Sable, 2008 Ford Taurus X, and 2008 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
The blower motor switch is mounted in the climate control module and controls blower motor speed by adding or bypassing resistors in the blower motor resistor in all modes except OFF.