My car is an 09 challenger r/t 6 speed with around 62,000 miles. Last weekend when driving my challenger home, it suddenly started blowing cold air out. I turned it off of defrost and onto the vents and it started working fine. Well the next evening when driving home it done the same thing. Only this time it kept blowing out ice cold air from the vents. Then it finally started blowing out hot air.. then randomly back to ice cold air. I wouldnt think this would be the heater core because it just goes from very hot to very cold... nothing in between. Any ideas on what could be causing this?