2000 Mustang GT with an 03 Gt motor.....I am having annoying overheating issues. Currently I have new fan, water pump, thermostat, and CCRM and have taken it to get a radiator flush. I know my fans are turning on for sure. It is mainly overheating when I am stuck in traffic for a few minutes. Once I start to drive and pick up speed it cools back down but as soon as I exit the highway or get stuck in more traffic for another few minutes it starts to overheat again. There is no oil in the coolant nor coolant in the oil. At this point any and all suggestions are very much appreciated.