Use Internal or External Air Circulation in Cold Weather?

[DiCharles]

Whether to use internal or external air circulation in cold weather depends on the situation: 1. Internal circulation is mainly used when driving on general urban roads; 2. If driving on highways or long-distance routes, it is recommended to use external circulation; 3. Do not use external circulation in traffic jams, otherwise, the car interior may smell of exhaust fumes. In winter, the car's air conditioning is used almost daily, as it is a very important comfort feature in vehicles. When the car's air conditioning heats the cabin, the high-temperature coolant from the engine passes through the heater core, and the air blown by the blower also passes through the heater core, allowing warm air to be blown out from the air conditioning vents.