Hello PJ.
Usually when this happens the electric cooling fan on the radiator isn't coming on.
As you are moving air is going through the rad cooling it. When stopped or moving slowly there isn't enough airflow so the fan should come on.
Possible problems are a blown fuse, something jamming the fan blade, bad motor for the fan, bad wiring connections, bad relay or a sensor not detecting proper temperatures.
If the fuse is blown something caused it to do so, most likely a jammed fan or shorted out motor.
To begin, check the fuse, make sure the fan isn't jammed up with something, check wiring for shorts and bad connections.
There are the possible problems as you have asked.
Thank you for using FixYa.
KL
For car running hot and overheating issues,i suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems :----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?
http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?
http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
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Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.
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