Should You Use Internal or External Air Circulation When Driving in the Rain?

2 Answers
DelLincoln
07/24/25 4:53am
When driving in the rain, you should turn on the external air circulation. Here are some tips for driving in the rain: 1. Driving in the rain: When driving in the rain, one of the biggest issues is that the windows are usually completely closed, which leads to poor air quality inside the car due to lack of air circulation. 2. Turn on the external air circulation: You need to turn on the external air circulation to allow more fresh air from outside the vehicle to enter the cabin, providing better air quality for the driver and passengers. While driving, the humidity inside the car tends to be high, which can cause the windshield to fog up easily.
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JakeDella
08/11/25 12:33am
When driving in the rain, I usually turn on the recirculation mode first to prevent the windshield from fogging up. After all, the outside humidity is high, and when warm air hits the cold glass, it condenses and fogs up, making it dangerous as visibility is reduced. The recirculation mode cycles the air inside the car, reducing the entry of external moisture, which is especially effective during heavy rain. However, if left on for too long, the air inside can become stuffy, and the lack of oxygen can make you drowsy. So, once the fog clears, I switch to fresh air mode to get some fresh air, or simply turn on the AUTO mode of the air conditioning, which automatically controls the recirculation and fresh air modes to maintain comfort. Another trick is to lower the air conditioning temperature, which helps dehumidify faster, combined with using the wipers to clear the view. Safe driving is key, and adjusting flexibly ensures peace of mind.
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