My car today after about 13 min of driving said that the temp was 260! What is up with this its not even hot out. First 6 min was at 75mph and then I drove through a car lot stopped looked at 4 cars and then left and the rest of the way home I was doing 40mph. When I got home it was hot fans full blast and all. What would cause this like I said its not even hot out here.