Hi, I just recently  purchased 2001 X5, Question I have is, can can I change fan speed for front whinshied defrost? Reason is everytime I turn on front windshield defrost, Fan blows full blast. When I try to change the fan speed, defrost disables and goes to previous setting such as A/C or heater. Since climate control is digital automatic I figured it will control fan speed automaticly, but it did not happen. It seems like it only has one speed. Is this normal? Any idea?