1993 Buick Riviera Owner's Manual - Page 123

To rid the system of stale air in warm weather,air will come out of the floor outlets for a short time. Bi-Level H Fan Speed The speed of the blower fan is controlled automancally' if you have the fan AUTO. on However, if you want the blower to run at a lower fan speed, pushv. If you want toraise the A blower speed, push . The blower speed willgo lower or higher withevery push of the button until the lowest or highest speed is reached. This setting is designed for use on sunny days where the-air is only moderately warm or cool. On days like these, the sun may adequately warm your upper body, but your lower body may not be warm enough. The Bi-level setting directs outside air into your vehicle in two ways. Cool air is directed toward your upper while body through thefront instrument panel outlets, slightly warmed air is directed through heater outlet the at your feet. The air conditioner compressor operates in all Air Conditioned positions, and the Defrost position when the outside temperature is above OF (8 C) 40 121