A/C is not on when this happens. Mechanic could not duplicate condition and had the car for 3 days. I had the car for 3 days after and when I was on line at a fast food restaurant, it began to overheat. i turned the heat on high and it cooled down.
my car overheats when idling and moving in slow traffic on 2004 Ford Focus
it sounds like your electric fans are not turning on, take it to the shop & have them check the fan relays.Turning the heat on is a great way to help ur car cool down in that given situation tho it might also be a good idea to turn the car off if ur going Tobe stopped for any extended period of time.