I've been having an issue with my vents not blowing the proper air. For a while only the driver side vents were blowing hot air, and the passenger side the air was cold. Now only the defroster vents blow air at all but still only driver side is hot air. None of the vents work when the a/c is on... Also this maybe something totally unrelated but when the heat is running and the truck is idling it sputters and sometimes stalls out. My vehicle is a 2004 Isuzu Ascender