This is normal. The fan is on to circulate are through the rad, and when you are standing still in traffic it seems the A/C is a little warmer and this is because there is no air moving through the Rad, but when you start moving the air moves through the rad and cools it so the air cools in turn. But yes, this is normal, since the fans are electric, there are no belts turning the fan, is it is only needed when the A/C is on, but if you idle for a long time in hot weather you will see the fans come on in that situation as well. They are meant to keep hot air from entering hot air from the engine back into the intake. The engine needs coolant and cool air to not over heat, this is long, But yes, this is normal.
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