All the other vents work fine (defrost, floorboard, rear air). I can hear the air blowing but it won't come out of the vents facing the passengers in the front seats. Anyone know why it's doing this? All the settings work, I just can't get air to come out of those 4 vents on the dashboard.

 

And the vehicle is .... ????

 

04 Trailblazer LS, V6, 4WD, EXT.

 

some of the responses here really don't make any sense. why bother? keep crass comments to yourselves.

 

gonna go with a plugged polin fileter or cabin filter...behind the glove box usually

 

Check under the dash to make sure all the ducting is connected and not clogged by something.