CONTROLS AND INSTRUMENTS Set the air outlet select lever 1 and air source select lever 2 as shown in the figure, and slide the fan blower switch 3 on. Windshield demisting: The blower fan switch controls the volume of air delivery in four steps. - 2–51 - Fan blower switch: The air source select lever controls the setting of the air intake between the outside air and the circulation. 1 Air circulated in the vehicle. 2 Outside air brought into the vehicle. Air source select lever: