I have a 2003 honda civic ex with 110k miles that over heats after freeway speeds. The water pump and timing belt were replaced at 100k miles.The thermostat was recently replaced as well.
The interesting thing about this situation is that the car doesn't heat up when just driving around town. It is only noticed after 30 min+ of freeway speeds when the car is promptly stopped at a stop light or in traffic congestion. When I see the temperature gauge shoot up to hot (it moves faster than the second hand of a clock), I speed up if possible and it promptly falls back down to the normal operating temperature.
I have also noticed when the car is idling that the hot air blows cold air up until the car is moving again when then it returns to hot air. I have checked the coolant levels multiple times and it is normal.
Any suggestions would be greatly appreciated, I have no idea what to do next.