1999 Lexus RX 300 Owners Manual - Page 247

AIR CONDITIONING AND AUDIO 20R007a The air intake control button is used to switch the air intake between the OUTSIDE AIR mode and RECIRCULATED AIR mode. The indicator on the switch shows which mode is selected. D With the indicator on - For RECIRCULATED AIR mode D With the indicator off - For OUTSIDE AIR mode For normal use, it is best to keep the setting to OUTSIDE AIR mode. If recirculated air is used during heating, the windows will fog up more easily. If the engine coolant temperature becomes extremely high, the RECIRCULATED AIR mode is automatically selected. This is not a malfunction. When the engine coolant temperature is lowered, the previous mode resumes. If manual on-off of the air conditioning is desired - Push the "A/C" button to turn the air conditioning on and push it again to turn the air conditioning off. The air conditioning does not work if the outside temperature is lowered down to around 0_C (32_F). If the system is used for ventilation, heating in dry weather or removing frost or exterior fog on the windshield, turn the air conditioning off once it is no longer required. This will improve fuel economy. The air conditioning can be used for year-round automatic temperature control including cooling and dehumidifying operation. If the air conditioning compressor does not operate, the indicator of the "A/C" button will blink. If the indicator of the "A/C" button blinks even when the "A/C" button is pushed again, have the compressor checked by your nearest Lexus dealer. 230