How do i turn on the heat

Hello, This vehicle should have the dual zone climate control, with rear seat air conditioning. If this is the case, adjust the temperature to the setting you prefer, but there is no setting to change heat or A/C, it just adjusts automatically to what you want. If you have the temperature dialed up to blow warm/hot air, yet there is none, you may have an issue with a mode door or blend door under the dashboard, which will not allow the proper temperature air to be sent to the desired vents. If you have any other questions, or need more information, let me know, or, if you prefer one of our certified shops diagnose the issue, see the link below: http://repairpal.com/lexus-within-10-miles-of-philadelphia-pennsylvania-19106