Should You Use Internal or External Air Circulation for Long Summer Drives?

[StAxel]

When driving on highways during summer, it's advisable to alternate between internal and external air circulation. Internal Circulation: Internal circulation refers to the recirculation of air within the vehicle. This method cools or heats up the cabin quickly. However, due to the relatively enclosed environment inside the car, prolonged use of internal circulation on highways can lead to increased carbon dioxide levels. This may result in insufficient oxygen supply to the driver, potentially causing drowsiness and reduced concentration, which could lead to traffic accidents. When using internal circulation in the 'unique' driving environment of highways, special attention must be paid to air ventilation. External Circulation: External circulation forces air exchange between the interior and exterior of the vehicle. Since the air intake for external circulation is located below the windshield wipers at the junction of the windshield and engine hood, the air conditioning system actively draws in outside air to ensure proper ventilation.