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Originally Posted by sangio
May I ask why you like the defrost and A/C on at the same time?
When temperatures dip below freezing I like to have the defrost on and the A/C off for a few minutes to melt the ice on the windshield before leaving to work. Then when I am ready to leave the ice is melted and I don't have to scrape it off the winshield. I would think leaving both on would delay the process. On the other hand, I read in the manual that it is an advisable practice to 'excersize' the A/C at least once a month for a few minutes for lubrication. Maybe thats why Nissan designed it that way.
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It won't really delay the heating up... The main reason the A/C comes on with the defroster is to get rid of humidity. When your window fogs up and you can't see while driving in heavy rain, just flip the defroster on and since the A/C turns on, too, it'll evaporate the fog off the window MUCH more quickly...