2002 Pontiac Bonneville Owner's Manual - Page 177

Mode Buttons You may choose the direction of air delivery by selecting one of the five mode buttons. (Defog): This setting directs most of the airflow to the floor ducts and the windshield defroster. A small amount of airflow is directed to the side window defroster outlets. This mode can be useful to remove the moisture from the inside of the windshield when the outside temperature is cold or the humidity is high. (Floor): This setting directs most of the airflow to the floor ducts with some airflow directed to the side window defrosters. There is also a small amount of airflow directed to the front defroster. (Bi-Level): This setting directs airflow through both the instrument panel outlets and the floor ducts. There is also a small amount of air directed to the front defroster and the side window defrosters. (Vent): This setting directs airflow through the instrument panel outlets. FRONT (Defrost): This setting directs most of the airflow to the windshield defroster with some airflow to the side window defrosters and floor ducts. To improve windshield clearing performance when you select FRONT defrost, your air conditioning compressor will run automatically above approximately 40_F (4_C). This dehumidifies the air to help dry the windshield. Even though the compressor may be running, the A/C light will not come on in FRONT defrost unless you select A/C. RECIRC (Recirculation): Press this button to limit the amount of outside air entering your vehicle. This is helpful when you are trying to quickly cool the interior of the vehicle or to limit odors entering the vehicle. RECIRC may be selected in all manual airflow modes except FRONT defrost. If you select RECIRC while in defrost, the RECIRC light will flash to let you know that this is not allowed. This is to help prevent fogging. 3-3