Hey guys. I'm new to this forum but I posted a thread a few days ago and I see that most of you all are pretty mechanically intelligent. I have a 2001 Mustang GT and for some reason my heater will only work through the vents. It blows hot air. But the front & rear defroster don't blow any air at all. I'm just curious to see if anyone knows how to fix this. I've worked for NAPA and Autozone since I graduated high school so I'm more mechanically inclined then most females. But this issue has me stumped! lol.