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That's a limitation of most/all immersed bulb temperature sensors. They need to be surrounded by fluid (coolant) to operate. A rapid loss of coolant won't be detected as a temp rise because they don't work in air. That's why these guys exist.More out of interest.
The coolant temp sensor didn’t help me either when a coolant pipe burst on the way home after picking up my new vehicle, the engine overheated and shutdown. No warning.