Hit the heater like normal...Hit the up arrow (the arrow that controls where the air is coming out of, there should be 3..an arrow for the front or forward, down for your feet, and up) and that will allow you to control the speed of your fan so its not on full blast..that "up" arrow is the air that comes out from the dash that hits the windshield (same as the defrost function). And that is how you can control your front defrost...