1998 Pontiac Grand Am Owner's Manual - Page 134

/J VENT: Use when outside temperatures are mild, and little heating or cooling needed. Airflow is is through the instrument panel outlets. Set the center control knob to the temperature desired. Am Air Conditioning On very hot days, open the windows long enough to let hot, inside air escape. This reduces the time it takes for your vehicle to cool down, which should help fuel economy. HEATER: This setting brings heated air through the heater ducts, and some through the windshield defroster vents. 'fl If you have the optional engine coolant heater (engine block heater) and use it during cold weather, 0°F A/C For normal cooling on hot days, use with the (- 18 O C) or lower, your heating system will more quickly temperature knob in the blue area. The system will bring provide heat because the engine coolant already is in outside air and cool it. warmed. See "Engine Coolant Heater" in the Index. On cool but sunny days, the sun may warm your upper be body, but your lower body may not warm enough. v# BLEND: This setting divides airflow equally You can use BI-LEVEL withthe temperature knob in between the heater ducts and the windshield defroster the middle. The system will bring in outside air and vents. direct it to your upper body, while sending slightly DEFROST This setting directs air through the warmed air to your lower body. You may notice this windshield defroster vents located on top of the temperature difference more at some times than instrument panel. at others. MAX with For quick cool-down on very hot days, use If the the temperature knob all the way in the blue area. setting is used for long periods of time, the air in your vehicle may become too dry. w. 3-3