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Most cars are equipped with a valve that keeps coolant from flowing through the heater core when the heater is set to "cold".
In the winter, I start with the heater at "cold", then wait for the ScanGauge to show >190°F. Then I set the heater to "hot", and the coolant temperature falls ~20-30°F. I wait for the temperature to recover, then I turn on the blower to heat the cabin.
If it's really cold 10.5 months out of the year (in South Carolina?), you should get a block heater.
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