Today I was driving to bank the temp seemed fine around the half way mark. Turned car off to use atm when I turned the car back on the gauge read that it was in the red. After it running for about 5 min it went down to 3/4. Then I went to Target. When I came back to my car and turned it the gauge rose all the way to the right past the red danger zone, and seems to be stuck. I drove about ten miles home becuase I had my kids in the car and it was 98 degrees outside. What can the problem be, thermostat. Is it possible I did damage to the car. The car did not seem that it was overheating, no smoke at all.