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Well, it turned out that my coolant was vey slightly below "MIN" when the engine was cold. My local Indy topped it up to MAX (for free!) and the light is out.
I don't think there is a leak. I'm ashamed to say I never really carefully checked the coolant level and it may have always been this way. No drips or puddles on the garage floor. In my defense, it IS pretty hard to see.
The mechanic told me that it takes like 4.5 gallons, and the difference between MIN and MAX is less than a quart, maybe even a pint. No wonder the sensor is so touchy.
From now on I promise to carefully watch the coolant level!
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