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The thermostat is rated for 87C. This means it should start to open at around 87C and it will be fully open by around 102C.
Do you mean you could be driving along the highway and it will randomly drop from 100C to 80C just like that without any changes in engine or road speed? If this is true, this is not normal operation and I would suspect the thermostat is sticking and would replace it.
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Ali Al-Chalabi
2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record
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