2008 Cadillac STS Owner's Manual - Page 203

AUTO (Automatic): When this button is pressed and the temperature is set, the system automatically controls the inside temperature, the air delivery mode, the air conditioning compressor, and the fan speed. AUTO will appear on the display next to the fan, mode indicators, and recirculation indicator if the vehicle has a air quality sensor. 1. Press the AUTO button. 2. Adjust the temperature to a comfortable setting, generally, between 70°F (21°C) and 80°F (27°C). Choosing the coldest or warmest temperature setting will not cause the system to heat or cool any faster. If the system is set at the warmest temperature setting, the system will try to continuously heat the vehicle and will not adjust the system down as the vehicle warms up. In cold weather, the system can start at reduced fan speeds to avoid blowing cold air into the vehicle until warmer air is available. The system starts out blowing air at the floor, but can automatically change modes as the vehicle warms up to maintain the chosen temperature setting. The length of time needed for warm up depends on the outside temperature and the length of time that has elapsed since the vehicle was last driven. 3. Wait for the system to regulate. This may take from 10 to 30 minutes. Then adjust the temperature, if necessary. You can switch from English to metric units through the Driver Information Center (DIC). See DIC Operation and Displays on page 3-74. The air-conditioning system removes moisture from the air, so some water might drip underneath the vehicle while idling or after turning off the engine. This is normal. Manual Operation yN z (Mode): Pressing the mode switch and changing the mode cancels automatic operation and allows the operator to manually select the air delivery location. Press AUTO to return to automatic operation. The outboard air outlets always receive airflow regardless of the mode selected. See Outlet Adjustment on page 3-54 to change this airflow from the outboard outlets. To change the current mode, select one of the following: Y (Vent): This mode directs air to the instrument panel outlets. This mode splits the air between the instrument panel outlets and the floor outlets. In automatic operation, cooler air is directed to the upper outlets and warmer air to the floor outlets. This mode directs most of the air to the floor outlets with some air directed to the outboard outlets, and a little air directed to the windshield and side windows. 3-49 \ (Bi-Level): [ (Floor):