1993 Buick Roadmaster Owner's Manual - Page 135

i R ... the sun may adequately warm your upper body, but your Heating lower body may not be warm enough. When outside temperaturesare cold, 8liding:the upper . The Bi-level settbg directs outsideair.intoyour vehicle lever to Heater andthe'lower leverto :Warm will send, in two ways.-Coolair is directed 'toward your upper heated airthough the heater outlets, 'and-somethrough body through the front instrument panel outlets, ,while the defroster vents.Vent and Heaterarelabeled the slightly warmed air is directed through heater outlet d r economy positions. because the conditioner at your feet. compres.sordoesn't run in these..twosettings. "This reduces engine resulting in impioyed f y d . load, .The air conditioner compressor operates allAir in economy. Conditioning positions, and Defrost position when the .theoutside temperature is above 40 O F (4.5 C). Defrosting Ventilation The Defrost setting directs most the-air through the of defroster vents, and some through.the heater outlets. Use Formildoutsidetemperatures,when little heating ox fog cooling is needed, slidethe upper lever toVent, Air will,' defrost when you want to remove ,6r ice from the windshield. flow throughthe .instrument panel outlets. Use air the oudets to turn on, adjust and turn the air,flow. Adjust. off the lower lever to control the temperature; . . I . . , '. 133