If the engine is overheating at idle, then it is bad.

It should start to lock up somewhere around 95C and be fully locked before the engine hits 100C on a gas car.

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Ali Al-Chalabi

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