2006 Toyota Tundra Owners Manual - Page 314
2006 Toyota Tundra Manual
Page 314 highlights
'06 TUNDRA_U (L/O 0508) Rear vents (double cab models only) If air flow control is not satisfactory, check the instrument panel and rear vents. The instrument panel and rear vents may be opened or closed as shown. For removing frost or fog, it is recommended that you close the lower vent when using the "Floor", "Floor/Windshield" or "Windshield" mode. 314 2006 TUNDRA from Oct. '06 Prod. (OM34458U)