First off, how hot does it get?

It could either be a coolant flow problem or an airflow problem or a combination of both. Does it only warm up in traffic, or does it do so on the open road as well?

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Ali Al-Chalabi

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