BMW Repair: Air flow problem, 2001 bmw 325i, bmw 325i

Question
I have a 2001 BMW 325i with 140,000 miles on it. I just had it in the shop to replace the blower motor and resistor; they were replaced with new BMW parts. The problem is the volume of air coming out the vents is very low. You can hear the blower blowing but very little air comes out. It is cold when the AC is on and it doesn't matter which setting I have it on, the air is not coming out. I have had it to 3 mechanics (including a dealter) to try to figure it out and no one seems to know what the problem is. The dealer says they lubricated the doors and cables and that didn't do anything. Any ideas?

Answer
Was the volume of airflow "correct" before you had the motor and resistor replaced?  Why were they replaced?

Does the dealer agree that the flow is low?  If so, he should fix it (assuming the motor/resistor work was done there).

Also, check if your cabin filters are dirty/plugged.  This could also restrict the flow.