Why Does the Outside of the Windshield Fog Up When the Car Air Conditioner is On?

1 Answers
VanKinsley
07/29/25 9:20pm
Fogging on the outside of the windshield when the car air conditioner is on is caused by a significant temperature difference between the interior and exterior of the vehicle in the current environment. If the automatic air conditioning system allows selection of air vent positions, choosing the front windshield and center vent positions while turning on the rear windshield heating function can prevent fogging. You can activate the front windshield defrosting function and the rear windshield heating function. If the side windows fog up, slightly opening the windows can quickly remove the fog before closing them again. To use the air conditioner for defogging, adjust the air direction knob to the defogging position (i.e., blowing upward). For automatic air conditioning, simply press the defogging button for a very noticeable effect. It's important to note that the AC switch must be turned on (i.e., in cooling mode) as natural wind will not be effective.
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