Weather IQ: Why you can't trust your car thermometer

This has been one of the hottest first halves of July in Charlotte history peaking at 101 degrees on July 5. But your car's tiny thermometer isn't trustworthy when it comes to gauging temperatures.
When you get in your car and look at the dash, that temperature you see doesn't actually use a thermometer but rather something called a thermistor. The name comes from a combination of the words thermal and resistor. It measures temperature based on electrical current changes as heat is added or removed.
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I've been trying to explain this to people for years. Thank you.