I'm having the same problem with my 2003 explorer. Passenger side has strong air flow, driver's side vent barely blows, the center ones blow a bit. I've fiddled with the door behind the glove box last winter (had the cold air flow problem from that) but now I'm having trouble with the airflow in those vents. I'm guessing I'll have trouble with the cold air again this winter. Anyone have any other suggestions? I'd sure love to hear them. This is getting to be a real pain.