Bought this car a couple months ago. Car is fine driving around town all day long no problem. Drive at highway speeds for 30mins or more and then slow down below 25mph it starts to overheat then returns to normal after getting back to highway speeds. I have burped the radiator, changed thermostat, flushed and refilled radiator. Fans appear to work when AC is running but shut off as I shut off AC. Not sure if they run while I'm driving. Any ideas because I am baffled. This is my first Acura and first foreign car.