Mixed Signals

From a recent rental, here’s a dashboard indicator I’d never seen before. As far as I could figure out, while the car is warming up, the engine temperature light shows a green “cool” indicator. At least, it disappeared after a few minutes, so I concluded that was associated with the car warming up. We don’t want the engine to be too cold, and any indicator at all is perhaps a bad (or less good) thing, so it seemed to be a warning. But green is good, so is it good that it’s lit up? Is it good that the engine is cool? Is it bad when it goes out?

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