After about 15 days the noise just stopped and has not returned.The air does blow cold and I can set the fan on all levels but now I can't depend on it because of other issues I've had with this car. I believe its just a matter of time before it happens again.

I noticed a vibration noise coming from under the dash when ever I increased the speed of the blower for the A/C and Heater, to maximum. To avoid irritation, I just never increased the speed above medium. Now, a year and half later, the vibration noise is evident at medium speed and intolerable at maximum. I can hear the vibration at the next lowest setting for the blower. My car has only 12,104 miles.