Do you guys have air coming out of your feet setting or defrost? I had a problem with mine not coming out of my defrost or feet setting but just the face setting, big problem in the middle of winter in Mi.. There was a TSB for it but was for the prior year, warranty did not cover it and it was not a fun job to tackle. I had the shop do it... 300 bones later i had a defroster again. Good luck!
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Josh
2004, HO 2500 QC SB, 2 inch leveling kit, line-x bed liner, Silencer ring MIA, Amsoil filters, Edge Juice W\ Attitude, FarmBoysDiesel 5in. exhaust