If i take the car on the expressway and drive it the temperature remains in the normal range, but when i get off and come to a stop sign, the engine temperature starts to climb. When i get going again, the temperature drops back to the normal range. The radiator fans come on but the temperature will continue to climb till i get going. If i start the car in the morning, the temperature will climb to normal and stay there and will not start to climb. The radiator has been flushed, the thermostat replaced, the radiator cap replaced.