2003 Hummer H2 Owner's Manual - Page 199
2003 Hummer H2 Manual
Page 199 highlights
Heating On cold days when using manual operation of the the automatic system, choose floor mode to deliver air to the floor outlets. To warm or cool the air delivered, turn the temperature knob to the desired setting. If you want to use the automatic mode, press AUTO and adjust the temperature by turning the temperature knob. The heater works best if you keep the windows closed while using it. Defogging and Defrosting On cool, humid days, use defog to keep the windshield and side windows clear. Use front defrost to remove fog or ice from the windshield quickly in extremely humid or cold conditions. When using manual operation, choose defog and adjust the fan speed to your comfort level. When using front defrost, increase the temperature and fan speed settings. If you use the automatic operation and you select front defrost or defog from AUTO, the system will control the fan speed. Adjust the temperature and fan speed to your comfort level. After the windshield is clear, adjust the temperature to your normal setting and select the AUTO button and return to AUTO mode and fan control. For maximum front defrost performance under extreme icing or frosting conditions, increase the temperature setting to 90_F (32_C) and increase the fan speed to high. 3-7
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