How do you turn the heater on

see the round button in the middle that says AUTO? turn that round button clockwise towards the RED around the button. red is heat, blue is cold.select FRONT or REAR or both. in the middle of the AUTO button,it says AUTO,push that button in,the green light should come on,see what happens! you may have to just mess around with it some to learn all controls,fan speeds,etc..good luck!