The air recirculation button makes your car reuse inside air instead of pulling air from outside.
Use it when:
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It’s hot → cools the car faster and reduces AC effort
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You’re in traffic, tunnels, or polluted areas → keeps bad air out
Turn it off when:
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It’s cold or rainy → prevents foggy windows from trapped humidity
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On long drives → avoids stale air and drowsiness from CO₂ buildup
Bottom line:
Great for short-term cooling and blocking pollution—but don’t leave it on too long.