Should You Use the Recirculation Mode When Running the Car Air Conditioner?
2 Answers
Whether to use the recirculation mode when running the car air conditioner depends on the specific conditions inside the vehicle and your personal preferences. The fresh air mode (external circulation) functions to introduce fresh air into the cabin. It uses a fan to draw outside air into the vehicle, meaning the air passages between the exterior and interior are connected. The recirculation mode (internal circulation) serves to block polluted air. Functions of the fresh air mode: The fresh air mode replenishes the cabin with fresh air. When activated, the air intake located at the firewall is opened by the climate control system. The vehicle's blower then draws outside air through the micro dust filter into two heat exchangers (cooling and heating) within the evaporator. The air is then blown out through the vents. When the fresh air mode is engaged, the air intake remains open, creating a connection between the interior and exterior air. For example, if you're stuck in city traffic with the fresh air mode on, your cabin may fill with exhaust fumes because this mode allows outside air to enter. Functions of the recirculation mode: The recirculation mode closes the airflow passage between the interior and exterior. Without the blower running, there's no air circulation. When the blower is operating, it only draws air from inside the vehicle, creating internal airflow circulation. This mode primarily prevents external dust and harmful gases from entering the cabin. It's particularly useful when driving through smoky areas, dust clouds, zones with strong odors, or in heavy traffic where it blocks harmful exhaust emissions from preceding vehicles.
When driving with the AC on, I always start with the recirculation mode to cool down quickly. For example, in the scorching summer heat when it feels like an oven outside, recirculation keeps the cold air circulating inside the car, cooling it down in just a few minutes while also saving some fuel. Once the temperature drops a bit, I switch to fresh air mode to let in some outside air and avoid stuffiness that could affect breathing. On long trips or in city traffic jams, I'm extra careful: I avoid fresh air mode in polluted areas to prevent exhaust fumes, but switch to it in cleaner areas for fresh air. However, don't use recirculation mode all the time—prolonged use can increase carbon dioxide levels, making you tired or drowsy. Remember, adjusting flexibly based on weather and road conditions is the most practical approach, ensuring both comfort and safe driving. My experience is that maintaining a proper balance is key.
