Fuel-saving tips: Drivers urged to use little-known button in heat wave to save money

However, there are times when the air recirculation button definitely needs to be off.

This includes when it is cold outside. Recirculating hot air with this button in the winter is less effective, it will make the car cooler and could cause the windows to mist up.

When should the air recirculation button not be used?

if it’s wet

The button traps moist air inside the car, which can fog windshields, which could pose a safety risk.

This is dangerous because it limits visibility, but also because the extra moisture can cause the car to stall and make the driver drowsy.

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