I have an '01 TL. Under good weather conditions, I usually set the ventilation system to auto, but I turn off the AC. But with the AC turned off like that, it is near impossible to clear the fog from the windows when it's rainy and damp. I discovered today that the best thing to do in those conditions is simply to set the system to full auto. This way, the AC takes care of the moisture. There is no need to run the full-blown defrost option.
But the AC seems to run a bit harder at first, and then tapers off as the humidity clears away. Am I imagining things, or does the automatic climate control have a humidity sensor built into it?