I was driving around last night (around 30 degrees outside), and while I was on the thruway, my coolant temp light went on. It went off in about a minute, but I noticed something strange. The car was shooting out cold air instead of heat. The light went back on and stayed on till I got to my destination, blowing cold air the whole time. When I parked my car and came back to it a few hours later, light was off and eferything worked fine. What the hell was this??