2001 Buick Regal Owner's Manual - Page 156

Automatic Control For the most efficient operation, you should set the system temperature and press AUTO. The system will select the best fan speed and airflow settings to keep you comfortable. The air conditioning compressor will run if the outside temperature is above 40_F (4_C). You may notice a delay of two to three minutes before the fan comes on at start up in cool weather. Temperature Control The TEMP switch sets the temperature for the entire system when the light on the DUAL button isn't lit. If the DUAL button light is lit, this master temperature control sets the temperature for the driver only. Press the up arrow to raise the temperature and press the down arrow to lower the temperature. The display will show your selection for a few seconds, then the outside temperature will be displayed. If you push the AUTO button, the system will control the fan speed and airflow. For the automatic system to function, the temperature must be set between 61_F (16_C) and 89_F (31_C). The driver's temperature and passenger's temperature settings will be automatically maintained even if manual overrides have been selected except for settings at 60_F (15_C) and 90_F (32_C). Setting the temperature to 90_F (32_C) will lock control in full hot, direct air to the floor, and increase the fan speed to high. The system will not return to automatic temperature control until the temperature setting is lowered. Setting the temperature to 60_F (15_C) will lock control in full cold, recirculate interior air, direct air to outlets on the panel and increase blower speed to high. The system will not return to automatic temperature control until the temperature setting is raised. 3-5