Should You Use Internal or External Air Circulation When Turning on the Heater in Winter?

[DelCollin]

Whether to use internal or external air circulation when turning on the heater in winter depends on the situation: 1. If it's very cold, you can use internal circulation; 2. If driving on highways or long-distance routes, it's recommended to use external circulation; 3. If driving in congested traffic, it's advisable to use internal circulation; 4. If driving in areas with a lot of dust, it's recommended to use internal circulation. Heating principle of car air conditioning: When heating, the coolant in 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 vents. Cooling principle of car air conditioning: When cooling, the engine drives the compressor to operate, which continuously compresses the refrigerant and delivers it to the evaporator.