2002 Chevrolet Avalanche Owner's Manual - Page 193

(Floor): This setting directs most of the warmed air through the floor outlets and center floor console outlets (if equipped), as well as some air through the windshield defroster outlets and side window defroster outlets. If air from the center floor console outlets is not desired, turn the vents off at the console. Recirculation will not be available in this mode. See "Recirculation" following for more information. (Blend): Airflow is delivered through the floor outlets, center floor console outlets (if equipped), the windshield defroster outlets and the side window defroster outlets. The air flow can be divided between floor and defrost depending upon where the knob is placed between the settings. The air conditioning compressor may run to dehumidify the air to prevent window fogging. Recirculation will not be available in this mode. See "Recirculation" following for more information. (Defrost): This setting directs most of the air through the windshield defroster outlets with airflow also delivered from the side window and the floor outlets. When in defrost mode, the air conditioning compressor may run to assist in dehumidifying the air and limit window fogging. Recirculation will not be available in this mode. See "Recirculation" following for more information. (Outside Air): This setting should be used for normal system operation and directs the system to use outside air. This button is located under the fan knob. Using outside air will limit stale air odors and help to prevent excessively humid interior air (from wet boots or clothing or maximum passenger loads) from being redirected onto windows. Pressing the outside air button will cancel the recirculation button. (Recirculation): This setting limits the amount of outside air entering the vehicle to a very small amount. This button is located under the fan knob. This will be helpful to limit odors entering the vehicle and will assist in reaching comfort in very high temperatures. Pressing recirculation will cause the system to recirculate interior air continuously and may cause the vehicle windows to fog if the passenger compartment floor is excessively wet. Pressing the recirculation button will cancel outside air operation. To return to normal system operation and to prevent stale passenger compartment air, be sure to return to the outside air position. 3-3