1993 Buick Roadmaster Owner's Manual - Page 129

If your Buick has the Electronic Climate control option, it looks like this: The following information tells how it works: you Mode When you press MODE the button, it allows you to select the outlets you want heated or air conditioned air to come fiom. Ybu can select from UPPE,R, LOVWR or BI-LEVEL outlets by cycling ihrough. the MODE fdnction. The blower and the temperature will continue to in an be "automatic" MODE unless you changethe TEMP or FAN controls. 127