TOYOTA 2011 Tundra - Manual (Page 328)

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3-1. Using the air conditioning system and defogger
Front passenger side outlets
Direct air flow to the left or
right, up or down.
Turn the knob to open or close
the vent.
Rear outlets (CrewMax models only)
Direct air flow to the left or
right, up or down.
Turn the knob to open or close
the vent.