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03 Audi tt coupe, 85k

After normal driving (say for about 5 to 10 minutes) the car temp gauge is at the midpoint and will remain there indefinitely if the car is traveling at least 20 to 30 mph. However after sitting in traffic or at light for 5 minutes the car temp gauge travels to little bit over ¾ the way the hot. If the car continues to sit in heavy traffic or not move for an additional 30 to 45 minutes the car gets real close to overheating and sometimes does start overheating (car electronic module starts beeping and a thermostat appears.

Anyone have an idea of the what the problems could be or where I should start trouble shooting at?

Auxiliary fan?

Thanks for your help
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