The driver's side of my Tahoe's front a/c decided not to blow cold air this morning. Passenger side and rear air are fine, but the driver's side feels like I have the temp control on the hottest setting. I tried moving the temp slide to see if something got hung, but no dice. It also blows cold to my feet and out the vent, just no cold air through the two vents that blow directly on my face.

Any ideas?