If you have a ScanGauge, you probably should ignore the car's temperature gauge, as they're notoriously inaccurate. Mine jumps to its "normal" reading at about 140 F on the ScanGauge, and doesn't budge when temps climb to 210 F.
I would try keeping temps in the 195-205 F range. Note that you should size the grill opening for hot weather, or make it adjustable. The standard opening is probably sized to allow adequate airflow when climbing mountains in hot weather.
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