Ok... this just happened the last time I drove my car... it had been sitting for 3 weeks and the battery was dead, so I just swapped batteries and then noticed this new "issue". The air, high or low, hot or cold, even on "max"... it blows out the DEFROST holes above the dash by the door, and it blows at my feet, but NOT out the 5 dash holes, whereas it used to blow out of them really well.. to the point of annoyingly well if my eyes were already feeling dry .

Ideas?

 

http://shbox.com/1/4th_gen_tech2.html#HVAC_vacuum