Can Car Heater Remove Fog?

[NadiaRose]

Car heater can remove fog. After the water temperature returns to normal, turn on the heater, set the air circulation to external circulation to let outside air in, reduce the temperature difference inside and outside the glass, and eliminate the fog inside the window. Then switch to internal circulation to evaporate the fog. Turn the air conditioning temperature adjustment button to the heating direction, and the air direction button to the windshield vent. At this time, the hot air will blow directly onto the front windshield. This defogging method won't cause repeated fogging because the hot air dries all the moisture on the glass. However, when there is a large temperature difference inside and outside the window, fog may still form on the window glass. When the car has just started, the engine's water temperature is quite low. Turning on the heater at this time not only fails to defog but also adds burden to the engine and increases fuel consumption.