CarTalk.com Blogs Car Info Our Show Deals Mechanics Files Vehicle Donation

2015 Nissan Rogue - why does AC come on when I use defrost?

when I turn my heater to defrost and back …the ac comes on , this happens quite often, if I had the heat on more than a half hr it turns to ac

When you turn the defrost on, the AC comes on automatically to clear the moisture out of the air. Completely normal operation.