1999 Cadillac Catera Owner's Manual - Page 142

yellowblue In cold weather, when the system senses the need for heat, airflow will be directed out of the floor outlets. As the interior temperature approaches a desired setting, the blower speed will decrease. To maintain interior comfort, the airflow may move to the instrument panel air outlets and floor outlets (bi-level mode). On bright sunny days in cold weather, the airflow may come out of the air conditioning outlets (AC mode) to maintain comfort and prevent stuffiness. If your vehicle is sitting out on a hot day and you have the climate control system set for automatic operation, the air will first flow out of the floor air outlets during cool down. That is normal. This is to remove hot air from the air outlets. As the air is cooled, the airflow will move through the air conditioning outlets. To avoid blowing cold air in cold weather, the system will delay turning on the fan until warm air is available. The length of delay depends on the outside air temperature, engine coolant temperature or the time since the engine was last started. As the coolant warms up, the blower fan speed will gradually increase and air will flow from the heater outlets, with some airflow to the windshield to prevent fogging under most normal conditions. If you leave your vehicle, the system will remember the control setting the next time you start your engine, except for recirculation and rear defrost (heated backlite). Each ignition cycle cancels recirculation. Manual Operation You may manually adjust the air delivery mode or fan speed. HEATER/DEFROST: This setting directs air to the floor outlets and toward the windshield. AC: This setting directs airflow through the middle instrument panel outlets. BI-LEVEL: This setting directs air into your vehicle in two ways. Cool air is directed to the upper portion of your body through the middle instrument panel outlets while warm air is directed to the floor. HEATER: This setting directs warm air through the floor outlets. Some warm air is sent to the windshield to minimize fogging. 3-4