Is the car's recirculation mode A or M?

1 Answers
Lucille
07/30/25 9:55am
BMW's recirculation modes A and M are two types of AUC (Automatic Air Recirculation) modes in the vehicle. A stands for automatic recirculation, which automatically determines whether to use internal or external air circulation based on the air quality inside the car. M stands for manual recirculation, which keeps the air inside the car circulating internally. 1. Function of external circulation: External circulation mainly serves as ventilation, so it should be turned on when the air inside the car becomes stale. 2. Difference between internal and external circulation: Internal circulation simply closes the air intake, similar to running a fan in a closed room. The air circulates within a confined space, meaning exhaled air is re-inhaled, making it an unhealthy ventilation method.
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