Should You Use External or Internal Air Circulation in Winter?

[ClaraMarie]

There are two scenarios for using external or internal air circulation in winter: 1. For short-distance driving, internal circulation can be used; 2. For long-distance driving, it is recommended to turn on external circulation to replenish fresh air. If driving on congested roads, it is advisable to use internal circulation to avoid exhaust fumes entering the car. During winter, the car's air conditioning is used daily. The car air conditioning can provide both heating and cooling. The heating principle of car air conditioning is much simpler than the cooling principle. When heating, the high-temperature coolant from the engine flows 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.