Is the recirculation light on for internal or external air circulation?

[SanMiguel]

When the recirculation light is on, it indicates internal air circulation. Internal and external air circulation refer to the air source for vehicle ventilation. The car's air conditioning control panel has an air source toggle button - some vehicles feature separate clearly marked buttons for internal and external circulation. Simply press to illuminate and activate the corresponding mode. During traffic congestion, always switch to internal circulation to effectively prevent harmful exhaust fumes from entering the cabin. For short-distance driving, internal circulation is also recommended as it helps further reduce fuel consumption. For long-distance travel, prioritize external circulation to maintain fresh air inside the vehicle and prevent driver fatigue caused by oxygen deprivation that could lead to accidents. In summer when the car has been exposed to intense sunlight, first activate external circulation to expel hot air, which reduces the air conditioning workload. When smoking, use external circulation to quickly remove harmful gases from the cabin.