Heating; Defogging And Defrosting - Hummer 2003 H2 Owner's Manual

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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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