Mine has a touchscreen and the "Dual" setting doesn't work properly. When it's set the temperature for both sides only follows the passenger's input, although the driver's side temperature display goes up or down to suit your input. When "Dual" is off the driver's side controls the temperature correctly for both sides. I like it cool but my wife likes it hot! (ooh 'er Missus!) Is the fault likely to be electronic withing the touchscreen unit?