i am having a problem with the air vents on my 328i. i have the automatic climate control which is working fine so far, but i do not feel air blowing out of any of the dashboard vents. The fan is working and when i set the air to come out of the footwells, the car heats up fine. I have moved the vents to make sure they open and they seem fine. any ideas? i am planning to replace the micro-filter to make sure it is not related to that.