Function Control Lever
WARNING: This page is about a different car, the 1994 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
Function control lever activates a vacuum selector valve which controls air source intake and distribution. Lever also operates blower switch and A/C clutch operating circuit. Ambient temperature switch in clutch circuit and mode switch must both be closed to operate clutch. See Figure.