I got an error Message this morning that said "ENGINE HOT A/C OFF" any ideas?

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This also happened last week and it seems to be fine on the drive home. i checked and the coolant is not low. It also appeared as if the temp gauge was not working. when i got to work the engine was not hat at all. the car has 103,000 miles on it and has never given any problems. hope it is an easy fix.