The mystery button in your car: we explain everything

This little, often overlooked button plays a crucial role: it blocks the flow of outside air and circulates the air already present in your cabin. Think of it as a closed-loop system where the air is constantly filtered and recycled.

Your air conditioning or heating then works only with this indoor air, treating it according to your settings before redistributing it through the vents.

Be careful though: this practical feature needs to be used wisely.

The perfect times to use it

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