Should You Use External or Internal Air Circulation in the Car During Winter?

[JayceLynn]

In winter, you can use either internal or external air circulation for the car's heating system, depending on the specific situation. The details are as follows: 1. If you want to heat the car quickly in winter, you can start the engine and drive normally for a while to warm it up. Once the temperature gauge needle reaches the middle position, turn on the internal air circulation for heating. Using internal circulation allows the air conditioning to rapidly cool or heat the car interior. This not only warms the car quickly but also avoids putting extra load on the engine, saving fuel. 2. However, although continuous internal circulation keeps the car warm, it creates a relatively sealed indoor environment. Prolonged exposure to this environment can lead to oxygen deprivation. Therefore, it's best to switch to external circulation every hour to draw in fresh air from outside. This air is then passed through the air conditioning evaporator or heater core to produce cold or warm air, respectively.