bypass logic for defrost a/c
When you turn the knob on defrost, it automatically turns the a/c on (it keeps the LED off) and put the recirculation on "outside air".
To bypass the automatic logic, put the knob in defrost, and press the "recirculate" button 5 times in less than 3 seconds, the LED will blinks to notify you changed mode.
Now when you set the knob on defrost, you can control the a/c on or off pressing the button.
PS: I know it was a "mod" before, but now it's in the manual!
E chu ta!