2008 Toyota Avalon Owners Manual - Page 207

3-1. Using the air conditioning system and defogger Adjusting the position of and opening and closing the air outlets Center outlets Turn the knob to open or close the vent Direct air flow to the left or right Side outlets Turn the knob to open or close the vent Direct air flow to the left or right Rear seat outlets Turn the knob to open or close the vent Direct air flow to the left or right 182