1993 Buick LeSabre Owner's Manual - Page 124

PASSENBER CLIMATE CONTROL The right front seat passenger can also activate the dual zone function by pressing the WARM or COOL buttons on the passenger door. Fan Speeds The speed of the blower fan Ilr t- is controlled automatically if you have the fan on AUTO. --%- AUTO The indicator above the control will show the difference from the main temperature setting. If you want the blower fan to run at a lower speed, push the LO button. The blower speed will decrease with every push of the button until the lowest speed is reached. ~