1998 Pontiac Grand Am Owner's Manual - Page 135

Heating Turning the right control knob to HEATER and the center CUR^^ knob to the right sends some heated air through the heater ducts toward your feet, and some vents. through the defroster Defrosting and Defogging To defrost the windshield,u n all three controlknobs to tr the far right. The DEFROST setting directsair through the defroster vents locatedon top of the instrument panel. VENT and HEATER are economical positions because To warm passengers while keeping the windows clean, two the air conditioner compressor doesn't run in these use BLEND. settings. This reduces engine load, resulting in improved To defog the side windows,t r the right control knob un fuel economy. Ifeither setting fails to keep you comfortable, or causes your windows to fog up, turn theto BI-LEVEL and the fan control knob to HIGH. Aim the side vents toward side windows.For increased the right controlknob to oneof the air conditioning airflow to the side vents, close the center vents. positions, or to DEFROST. If you have the optional engine coolant heater (engine use 0°F block heater) and it during cold weather, (- 18 C) or lower, your heating system will more quickly provide heat because the engine coolant is already warmed. See "Engine Coolant Heater" in the Index. O 3-4