What does an active grille shutter mean?

[EvanFitz]

An active grille shutter is similar to common window blinds. The vehicle can automatically adjust the opening degree according to actual conditions. For example, when starting the vehicle in cold winter, the grille shutter will remain closed. In this case, the engine temperature can rise faster, which helps improve the car's performance in winter. After starting the vehicle, the active grille shutter will automatically adjust its opening degree according to the engine temperature to achieve rapid warm-up, allowing the engine to reach its optimal working state in a short time. Temperature greatly affects engine operation, and the engine is most fuel-efficient when in its optimal working state. Therefore, accelerating the engine's entry into the optimal working temperature in cold conditions indirectly improves fuel economy.