Winter Heating: Use External or Internal Air Circulation?

[DeLevi]

Whether to use external or internal air circulation for winter heating depends on the actual situation: 1. If driving on regular urban roads, internal circulation can be used; 2. If driving on highways or long-distance routes, it is recommended to use external circulation; 3. During traffic jams, external circulation should never be used, otherwise, the car may fill with exhaust fumes. Car air conditioning has both cooling and heating systems. Heating utilizes the car's own thermal cycle and does not require the compressor to work. The AC button activates the air conditioning cooling system, pressing it means the compressor starts working, primarily for cooling purposes.