ive found that on most autos, that even when the A\C is set to off. that if the air control is set to defrost or floor/defrost, its running the A\C to remove condsashon from the air.
only when its in a VENT mode or all to the floor is the A\C not going to run.
to prove my point, (on a rainy day) set it to floor, and A\C off.
in many modern autos the front window will fog up.
if you dont change the settings opening a window is the only way to pump out the damp air.
oh yea also the reticulated air mode will not work in the all air to floor setting in most autos...do to the A\C not running in that spot, unless you turn it on.
so in short, if you really want the A\C off pull the wire on the compressor LOL