I have a 2008 mustang V6 I have had for about a year now. about a month ago, when the heater or defrost was on, the air would just shut off. I noticed when it does this it still has power lights on the dials, but none of the buttons along the bottom will light up if pushed they do nothing. A Google search suggested the blower motor resister, if it was only working on the high settings, but mine works normally on all settings when it decides it wants to turn on. Sometimes it will turn on for one quick blast and then turn off again, or sometimes it will work as normally for a day or two. Any help would be appreciated, I love my car so much and I try and take good care of her, But I can't afford to just throw parts at it... any suggestions?