I hope I'm right in saying the air con button is the one with the picture of the snow/ice flake on it, below the heated rear window button. When I press my air con button it does not light up is this correct, or should it be on all the time once pressed.
Also is there a quick windscreen defrost option.

Thanks in advance.

 

I believe the light will only stay on if the blower motor is on.
Hope this helps.