Originally Posted by Mike Gilson

Hi Starship

Looks like you are getting somewhere. If you have the heater system layout as shown in the pic by 'Greg from OZ' and the button in the centre marked "EC" them you have and auto temp controlled aircon system. It is not the climate control they have in the US or in the more expensive options. The sensor in the light switch does indeed control the heating or cooling in the cabin by sensing air temp above the windscreen. You will notice, if all is working Ok, that if you adjust the thumbwheels to heat, hot air will come from the selected vents and gradually get less hot as cabin temp rises to meet the setting, and then maintains it without further adjustment. I find that my controls are very sensitive and an adjustment of a degree or so is all that is needed to achieve the desired degree of heating or cooling. Good luck