Why is there still condensation on the windshield when the heater is on?

[Scott]

Condensation still forms on the windshield when the heater is on due to the temperature difference between the cold exterior and warm interior. Solution: Adjust the air vents to direct airflow toward the front windshield, turn on the air conditioning cooling mode, activate the external air circulation, and use the maximum fan speed. This method typically takes only about ten seconds to quickly remove condensation from the glass. Principle: The higher temperature inside the vehicle causes water vapor from passengers' exhaled carbon dioxide to condense into tiny water droplets when it contacts the cold glass, creating condensation. Using warm air dries the moisture molecules on the windshield and circulates them outside the vehicle, preventing them from condensing into water droplets on the glass.