Hummer 2007 H3 - Manual (Page 172)

Recirculation is available in the bi-level, and vent
modes. Recirculation is not available while in
floor, floor/defog and defrost mode. If recirculation
is selected in these modes, the indicator will
flash three times indicating it is not available in
that mode. When the recirculation mode is turned
on, the air conditioning will turn on automatically.
H
(Vent): Turn the right knob on the control
panel to this mode to direct air to the instrument
panel outlets.
\ (Bi-Level): Turn the right knob on the control
panel to this mode to direct air to the instrument
panel outlets, and the remaining air to the
floor outlets and the defroster and side window
outlets. Cooler air is directed to the upper outlets
and warmer air to the floor outlets.
[ (Floor): Turn the right knob on the control
panel to this mode to direct air to the floor outlets,
side window outlets, and defroster. Recirculation
is not available in this mode.
Defogging and Defrosting
Fog on the inside of windows is a result of high
humidity (moisture) condensing on the cool window
glass. This can be minimized if the climate
control system is used properly. There are
two modes to clear fog or frost from your
windshield and side windows. Use the defog mode
to clear the windows of fog or moisture and
warm the passengers. Use the defrost mode to
remove fog or frost from the windshield more
quickly. For best results, clear all snow and ice
from the windshield before defrosting.
/
(Floor/Defog): Turn the right knob on the
control panel to this mode to direct the air to
the windshield, the side window outlets, and to
the floor outlets. When you select this mode, the
system runs the air conditioning system unless
the outside temperature is near freezing or below.
Recirculation is not available in this mode.
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