2010 Lexus IS 350 Navigation Manual - Page 228

AIR CONDITIONING D Switching between outside air and recirculated air modes (d) Defogging the windshield Recirculated air mode 2 Automatic mode 3 Outside air mode Push the air intake control button. The mode switches between recirculated air mode, automatic mode (on some models) and outside air mode each time the button is pushed. When the system is switched to automatic mode, the air conditioning system operates automatically. 1 The air conditioning system operates automatically. Recirculated air mode will automatically switch to outside air mode. It is not possible to return to recirculated air mode when the switch is on. CAUTION To prevent the windshield from fogging up Do not use the windshield air flow button during cool air operation in extremely humid weather. The difference between the temperature of the outside air and that of the windshield can cause the outer surface of the windshield to fog up, blocking your vision. 252