2007 Hummer H3 Owner's 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. 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. 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. / (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. 172