I had the temps set at two different settings, turned off the car and then restarted it. With no one in the passenger seat, it remembered what I had it set to before I turned off the car. So, yes, mine still showed the same temperature with no one in the passenger seat. I had to disengage the passenger temperature manually to get it to forget it. And, no, someone sitting in the passenger seat will not automatically engage the passenger temperature. However, once you turn it on, it should not be forgetting it. I have a 2010 Fusion and a 2009 Edge with dual climate controls and they both work that way.