2003 Suzuki Aerio, Don't know much about cars so If i can get a simple breakdown I'd really appreciate it! Have had this problem off and on; summer time I'd turn on the ac and NOTHING, no air flow whatsoever then all of a sudden it would blast on while driving and be fine. Same thing with the heat now, It has been working just fine and then just stopped. My rear defogger is working but no air from the front vents/defogger. Have been told maybe I just need antifreeze? Can any one shed some light on this? Any thoughts on where I should take it in if it's not something you think I can fix on my own.