2008 Toyota Prius Owners Manual - Page 235

3-2. Using the air conditioning system and defogger CAUTION n To prevent the windshield from fogging up Do not use 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. NOTICE n To prevent 12 volt battery discharge Do not leave the automatic air conditioning system on longer than necessary when the hybrid system is not running. 3 Interior features 207 PRIUS_U_(L/O_0802)