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How to Use Air Conditioning to Defog Windows in Summer Rain

2 Answers

VonCole

09/07/25 6:30am

Owners can turn on the A/C switch of the air conditioning, adjust the temperature to the lowest setting, use the internal circulation mode, and direct the air conditioning vents to blow cold air towards the front windshield. Alternatively, use warm air to blow towards the front windshield while turning on the external circulation mode to reduce the temperature difference between the inner and outer surfaces of the window glass. The fog will disappear within minutes.

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McCharles

09/19/25 5:42am

Dealing with foggy windows on rainy summer days can be really annoying. As someone who's been driving for years, here's how I handle it every time: First, turn on the air conditioning system and locate the defogger button (usually with a fan-shaped icon), pressing it will automatically adjust the airflow direction toward the windshield. Then, set the fan speed to maximum while ensuring the AC cooling mode is activated, as the cold air can quickly absorb the moisture. Since humidity is high on rainy days, I also engage the recirculation mode to prevent external moisture from seeping in. This makes the fog disappear incredibly fast, restoring clear visibility in just seconds. For safe driving, I either set this up before driving or pull over to operate. Regular maintenance of the AC system is also crucial, as cleaning the filters can prevent issues from occurring.

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