2010 Lexus IS 250 Navigation Manual - Page 254

D Switching between outside air and recirculated air modes Recirculated air mode or outside air mode may be automatically switched to in accordance with the temperature setting and the inside temperature. D Window defogger feature Recirculated air mode may automatically switch to outside air mode in situations where the windows need to be defogged. D When outside air temperature is below 32_F (0_C) The cooling and dehumidification function may not operate even when "A/C" is on. D When the indicator light on "A/C" flashes Touch "A/C" to turn off the air conditioning system and turn it on again. There may be a problem in the air conditioning system if the indicator light continues to flash. Turn the air conditioning system off and have it inspected by your Lexus dealer. D Automatic air intake change mode (on some models) In automatic mode, the system automatically switches between recirculated air and outside air modes according to whether the system detects harmful substances such as exhaust gas in the air outside. 278