If u have no symptoms, its doubt ful u did any damage... They are pretty durable... I know my g/f drove all the way from work in the red, pulled up it was steaming like a bitch from the engine... Her water pump blew (the reason she was overheating to begin with)... I changed out the timing belt and pump and it still runs like it used too... I was worried she blew the gasket or worse (warped head)... But im sure youd notice right away if either of those happened...