I've noticed that i'll have the thermometer as low as it goes (60 degrees i believe) on my 97 328i and yet when I'm driving i will feel a lot of hot air blowing out from somewhere where my legs rest. This is okay on a chilly night in the summer, but when it's like 90 degrees outside, its horrible! i have to roll all the windows down just to get some cooler air.
i've noticed also that it doesn't always do this, only once in a while. any ideas?