Above 100 in traffic is not abnormal. Exactly what temp is the car reaching? I wouldn't be worried about seeing 105C, but if it is regularly reaching 120C, then you have a problem.

The thermostat is not fully open until 102C and the aux fans do not come on high until the car reaches around 110C or so.

Is the car heating up on the highway, only in traffic, or a combination?

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record