Is the G35 coupe supposed to have bi-level air when the set heat temp is reached? Every car I have owned in the past several years (Mits 3000GT, Lexus IS300) vents cooler fresh air from the top vents while heat comes out the bottom vents once the set temp is reached in the "auto" mode. The manual doesn't refer to it and my G35 coupe doesn't seem to do this leading to what I feel is "stuffiness" in the air. Also while I haven't yet independently measured the cabin temp it seems like the auto temp settings are not accurate .... A usual setting of 69 produces heat that feels like 75+. Any comments?