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almost same thing happened to my integra. On the highway it will not overheat because there is always cool air cooling down the engine. The problem on mine was the thermostat was bad causing back pressure which was leaking coolant out of the spare coolant reservoir. Because of this, i would lose coolant and then it would eventually start overheating. Once i changed the thermostat, it was fine once again. Add coolant and see what happens. Next step i would be to change the thermostat. Good luck!