Should I Use Cold or Hot Air to Defog the Car?

1 Answers
Rosemary
07/30/25 4:39am
Both cold and hot air can be used to defog the car, but cold air works faster, though it may cause fogging to reappear. Hot air removes fog more slowly, but there's no need to worry about secondary fogging. The rear windshield defogging relies on heating wires, while the front windshield cannot be equipped with heating wires, so the car's air conditioning is used to defog it. Hot air defogging requires the driver to start in advance because turning on the hot air will initially make the fog denser, affecting driving visibility. Generally, drivers should turn on the hot air defogging a few minutes before starting the car.
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