How do you turn on the heater in a 1999 Lexus RX 300?

To turn on the heater in a 1999 Lexus RX 300, start by turning the ignition key to the "On" position. Next, set the climate control system to "Heat" by adjusting the temperature dial to a warmer setting and ensuring the air distribution is directed to the floor and/or dashboard vents. Finally, turn on the blower fan to your desired speed to circulate the warm air.