1997 Cadillac DeVille Owner's Manual - Page 171

If your vehicle is sitting out on a hot day and youit have To find your comfort zone, start with the O F (24°C) 75 set onAUTO, the air will first flow out the floor air setting and allow about minutes for the system to 20 outlets for a few seconds. That is normal. is to This regulate. Turn the TEMP/AUTO knob to adjust the expel hot air from the a r outlets. As the airis cooled, i temperature if necessary. If you choose 60°F (16"C), the the system will remain at that maximum cooling settingthe airflow will move through air conditioning outlets. If you start your vehicle with the fan setting on and will not regulate speed. If you choose the fan temperature of 90°F (32O C ) , the system will remain at HI, it will skip the air conditioning purge. that maximum heating setting and will not regulate fan To avoid blowing coldair in cold weather, the system will speed. Choosing either maximum setting will not cause delay turning on the fan warm ar is available. The until i the system to heat orcool any faster. length of delay depends on the outsideair temperature, With the automatic setting, air conditioning the engine coolant temperature or the time since the engine compressor automatically cycles when needed to cool was last started.As the coolantwarms up, the blower fan ar the air. In cold weather, when the system senses the need speed will gradually increase andi will flow from the heater outlets, with some airflow to the windshield to for heat, the airflow will directed out the floor be outlets. As the interiortemperature approaches a desired prevent fogging under most normal conditions. setting, the blower speed will decrease. maintain To If you leave your vehicle, the system will remember the interior comfort, the airflow may move to the instrument control setting the next time you start your engine, panel air outlets and floor outlets (bi-level mode). On except for recirculation and defrost. Each ignition cycle bright sunny days in cold weather, the airflow may come cancels recirculation, whereas, DEFROST will change out of the air conditioning outlets(AC mode) to to automatic operation when the ignition is shutand off maintain comfort and prevent stuffiness. then turned back on.