I noticed that when I use the defroster and the A/C light comes on and the only way I can shut the light off is by pressing the A/C button.. I know this thing is able to take moisture out of the air through A/C. Does anyone one have any insight on how this works...The book states the light comes on when using the defroster but should beable to shut off by turning the fans off.. Mine don't do that.. It also states that the A/C comes on but the light should not come on when using the defroster..