my vents would blow hot air only for about 6 months before I brought the car in to have the relay replaced. It fixed the problem perfectly. However 2 weeks later I was driving back from an 18 hour road trip and the vent stopped blowing completely. No hot, no cold. When I push the "on" buttion and move the settings from floor to defrost to eye level, nothing blows. I can hear a very faint sound of something turning inside the unit...sounds like a muffled disc changer changing CDS. Please help before I get taken for $$$$$ its the middle of summer! Thanks!