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the ac compressor puts a significant extra load on the motor, so motor has to work harder, creating more heat. at highway speeds, there is a much larger volume of cooling air flow through the radiator helping keep it cool. I suggest you give an inspection to the cooling system. I believe the Honda has an electric fan that is thermostatically controlled, do you hear it running when the car is overheating.? If not, check the fan and thermostat. Also, since the car is almost 20 years old, the radiator may need a little service.

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Q: Your 1990 accord over heats in city driving with the AC on if you turn the AC off it cools down it does not over heat at highway speeds?
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