What Do the Interior and Exterior Circulation Modes in a Car Mean?

[CooperAnn]

Introduction to the interior and exterior circulation modes of car air conditioning: 1. Interior circulation means the air circulates only inside the car, driven by the blower to cycle the interior air. 2. Exterior circulation connects the inside of the car with the outside. While the car is moving, airflow automatically draws in outside air due to wind pressure. When stationary, outside air can still enter the blower through the air ducts and be blown into the car. Below are some scenarios regarding when to use interior or exterior circulation in car air conditioning: 1. When the outside air quality is poor, to prevent harmful gases from entering the cabin, set the system to interior circulation. 2. During long highway drives, to prevent a decrease in oxygen levels inside the car, alternate between interior and exterior circulation modes.