tonight was the first night ive driven where it was pretty cold, and noticed that my side vents in my 1993 190E 2.6 was sometimes blowing hot air through and sometimes cold air.

i have the temperature switch turned all the way to cold, and im using the button that looks like a rectangle with a line down the middle.

my car wasnt doing this before (as in last week), and since then, i have switched my MAS control unit out, and have been flooring it quite a bit because of the new found power in my car.

anyone have ideas why its doing this?