Overheating is over 120C.

Look at the expansion tank, it should be filled to the top of the clear part of the tank. That is, the level should be at the point where the clear part and black part of the tank joins.

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Ali Al-Chalabi

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