My 350z which is about a year old has been doing something weird. Recently, when i turn on the fan, warm air would come out from the vents. I do not have the A/C on and have set the temp at 12 o'clock at about 75 degrees? but it gets kinda hot. But when I turn on the A/C, cold air comes out and there is no interference. Do you guys know whats up?

 

manual. you aren't set correct.

 

I had the same problem on my '05. Dealer had to replace the heater/AC control. No problem now.