Gotcha.
I would imagine that the inside of an ice chest will equal the trunk temperature after a matter of days (no ice), and then once it does it will take even longer to cool the inside of the ice chest back down at night.
That's my guess at least... your data seems to point toward that?
No, like Russ said, the cooler box temperature will fluctuate at somewhere around midway between max/min trunk temperature. Actually, the temperature inside the cooler will fluctuate pretty close to the average temperature of the trunk. The better the cooler, the less min/max fluctuations.
Heat flow is not a one way process. When the trunk is cooled at night, the heat flow is from the ice box to its environment.
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