The general strategy I've seen for coolant temp gages on a number of automotive engines is to (ideally)
- read liquid temp when bathed by liquid
- read metal temp when no liquid
However, a very common occurrence is that when the liquid subsides from being low or boiled off, the probe reads air temp...which is unsuitably low.
My thoughts are that the temp probe should be like a flat puck that fits tightly against a machined area on the cylinder head, intake manifold, etc so that the water jacket bathes the area in a strong flow of coolant when OK and then you actually do read the metal temp when the liquid disappears.
So far this brilliant idea isn't in production anywhere in the world so take my confidence in its superiority with a few blocks of salt.
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