while driving, the A/C stopped blowing air completely, what could be wrong?

Sounds like your blower motor needs to be addressed or replaced. As far as checking yourself, that all depends on your technical ability and confidence level. Here are some videos on how to do it...if that is your problem. We always recommend a diagnosis by a certified mechanic to ensure you don't end up wasting money replacing good parts. http://www.bing.com/videos/search?q=how+to+replace+2010+mitsubishi+outlander+blower+motor&qpvt=how+to+replace+2010+mitsubishi+outlander+blower+motor&FORM=VDRE