2008 Toyota Tundra Owners Manual - Page 427

07 11.20 Instrument panel and rear vents D To heat the vehicle interior while defrosting the windshield, choose floor/ windshield air flow. 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. XS19024 Close Open Close Open Side and center vents Open XS19023a Close Rear vents (Crew Max models) 397 2008 TUNDRA from Apr. '08 Prod. (OM34477U)