Is the Recirculation Light On or Off?

[StJanelle]

The air conditioning system's recirculation and fresh air buttons generally come in two types. The first type has separate buttons for recirculation and fresh air modes, where an illuminated light indicates the active function mode. The second type combines both functions into a single button, where an illuminated indicator signifies recirculation mode, while an unlit indicator means fresh air mode. More details are as follows: 1. The purpose of the air conditioning recirculation mode is to prevent outside air from entering the vehicle. When outside temperatures are extremely high or low, using recirculation mode allows the air conditioning system to operate in this mode briefly, quickly lowering or raising the interior temperature. 2. The fresh air mode allows outside air to enter the vehicle for circulation. If equipped with an air quality sensor, the system will automatically switch to recirculation mode when detecting increased concentrations of harmful substances in the outside air, preventing it from being drawn into the cabin. 3. Once the concentration of harmful substances in the outside air drops to normal levels, the system will automatically deactivate recirculation mode, allowing fresh air to enter the vehicle again.