Temperature Lever
WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1983 Mercury Zephyr, 1983 Mercury Marquis, 1983 Mercury Lynx, 1983 Mercury LN7, and 1983 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
Temperature lever is connected by a cable to blend air door. When lever is in "COOL" position, air by-passes heater core. In "WARM" position, air is directed through heater core. In intermediate positions, air is directed both through and around heater core and mixed to produce air of the desired temperature.