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Another aspect -
The engine cooling effect of adding engine heat to the a/c'd cabin air can be a good thing if it's running a bit hot.
On my ScanGauge, I've seen this add just enough engine cooling to the system to bring the ECT down into its normal range, when I forgot to remove some grill blocking that wasn't appropriate for the weather.
If you have a digital engine temp gauge (ScanGauge includes one) you can see it happening in detail.
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Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.
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