2003 Lexus GS 300 Owners Manual - Page 167

AIR CONDITIONING When the "FRONT WINDSHIELD" button is pushed while operating in automatic mode, the air conditioning is set to operate and the OUTSIDE AIR mode is set. If you push the "FRONT WINDSHIELD" button once again while in the FRONT WINDSHIELD mode, the mode then returns to the last mode used. (c) Air conditioning filter CAUTION Do not use the "FRONT WINDSHIELD" button during cooled air operation in extremely humid weather. The difference between the temperature of the outside air and that of the windshield could cause the outer surface of the windshield to fog up blocking your vision. The air conditioning filter information label is placed in the glove box as shown and indicates that a filter has been installed. The air conditioning filter prevents dust from entering the vehicle through the air conditioning vent. The air conditioning filter is behind the glove box. The air conditioning filter may clog after long use which will reduce the air flow. However, you can inspect the filter easily. When you inspect and replace the filter, be sure to turn off the fan. 146