Defogging with Cold Air or Warm Air?

[StStephanie]

Both warm air and cold air can be used for defogging, but cold air works faster, though it may cause secondary fogging. Warm air defogs more slowly, but there's no concern about secondary fogging. Introduction to the car defogging system: 1. The rear windshield defogging relies on electric heating wires, while the front windshield cannot be equipped with heating wires, so the front windshield uses the car's air conditioning for defogging. 2. There are air vents below the front windshield of the car, which are used to blow air onto the front windshield. On the car's air conditioning control panel, there is also a windshield defogging button.