Yes, 120 is too hot. Start by diagnosing the problem. Was temperature normal until you were stopped in traffic? If so, then I would suggest you start by examining if it is an airflow problem. Are the fans fuctioning properly?

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Ali Al-Chalabi

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