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More likely the heat is carried away by the diesel in the injector line. Once you stop, you don't have cold diesel flowing in the line by the coolant line. Also, it is common for coolant temps to increase a bit for 10-20 miunutes after you stop, again, because there is no air flow in the rad to remove the heat quickly. I have heard that for the Aussies, this can be a problem in the 40 + temps if they don't let their vehicles - including non-turbo diesels - cool down a bit after a hard highway or trail run.
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