2012 Toyota Prius Owners Manual - Page 549

3-1. Using the air conditioning system and defogger Defogging the windshield Press . The dehumidification function operates and fan speed increases. Set the outside/recirculated air mode button to the outside air mode if the recirculated air mode is used. (It may switch automatically.) To defog the windshield and the side windows early, turn the air flow and temperature up. To return to the previous mode, press again when the windshield is defogged. Air outlets and air flow Air flows to the upper body. 238