Ever noticed that when you get in your car on a really hot day, the thermometer on the dash seems a big exaggerated from what the actual outside temperature is? That’s because it’s technically a thermistor, not a thermometer. A thermistor measures temperature based on change in electrical currents that temperature causes instead of using a liquid like mercury. And on most recent cars, the thermistor is somewhere on the front of the car which is what causes the inaccurate reading, according to Road and Track.
Usually the thermistor is in the grille somewhere which means it’s close to the ground and picking up the head coming off the cement. That’s the reason your dashboard reading is higher than your phone or other temperature reading. So while your car thermometer is a good guideline and nice feature to have, I wouldn’t count on it for accuracy.
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