ANSWERS: 2
  • Turning the defroster on in newer cars usually automatically turns on the A/C. The reason is because cold air helps dehumidify the air and helps clear any fogging on your windows.
  • Hot air. In the winter the fog usually freezes and turns to ice heat melts it and helps it to evaporate faster, If you go from ice cold then straight to full hot you could crack you dash or possibly even the windshield though.

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