Where is the external circulation button on the Buick LaCrosse?

[VanAdam]

Here is the location of the external circulation button on the Buick LaCrosse: Below the center console, there are three knobs. Under the largest middle knob, there are three buttons. The middle button controls the internal and external circulation. When the button is pressed and the indicator light is on, it indicates the internal circulation is activated. Pressing it again to turn off the indicator light means the external circulation is activated. Below is additional information about the Buick's external circulation: 1. External circulation connects the interior of the car with the outside. While the vehicle is moving, airflow automatically enters the car due to wind pressure. When stationary, outside air can still enter the blower through the air ducts and be blown into the car. 2. When you first purchase a new car, you should try to use the external circulation as much as possible to maintain air flow between the inside and outside of the car. This helps to quickly release harmful gases from the car's interior. 3. During long periods of high-speed driving, if the internal circulation is kept on continuously, it can lead to insufficient oxygen inside the car, causing driver fatigue and potentially leading to traffic accidents. Therefore, it is necessary to turn on the external circulation to replenish fresh air inside the car.