the air recirculation button in a car controls whether the air inside the cabin is recycled or fresh air is brought in from outside... during normal driving conditions, it is generally recommended to use the recirculation mode when the air conditioner is on, as it cools the cabin more efficiently and helps reduce fuel consumption... it also prevents dust, smoke, and unpleasant odours from entering the vehicle...
however, during heavy rain, it is advisable to switch to the fresh air (outside air) mode... this helps reduce humidity inside the cabin and prevents the windows from fogging up, which can obstruct the driver's visibility... if the windows begin to mist over, turning off recirculation and using the air conditioner or defogger with outside air will help clear the glass more effectively and improve driving safety...
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