2008 Toyota Highlander Owners Manual - Page 851

3-1. Using the air conditioning system and defogger n Window defogger feature Recirculated air mode may automatically switch to in situations where the windows need to be defogged. n When outside temperature approaches 32°F (0°C) The air conditioning system may not operate even when is pressed. (outside air) mode CAUTION n To prevent the windshield from fogging up Do not use during cool air operation in extremely humid weather. The 3 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. Interior features NOTICE n To prevent battery discharge Do not leave the air conditioning system on longer than necessary when the engine is off. 255