In winter, it is best to keep the car air conditioning temperature between 18°C and 25°C. Generally, a temperature difference of within 10°C between the inside and outside of the car is advisable. If the temperature is too high, the large temperature difference between the inside and outside of the car can easily lead to catching a cold when getting out of the car. If the temperature is too low, it will affect driving comfort. In winter, it is generally recommended to alternate between the internal and external circulation modes of the car air conditioning. After starting the car, first turn on the external circulation to expel the cold air from the car, then switch to internal circulation to warm up the car. When alternating between the modes, it is best to decide based on road conditions. On open roads without odors or sandstorms, you can use the external circulation mode. If you are in heavy traffic, areas with severe exhaust emissions, or places with strong sandstorms, you can switch to the internal circulation mode. When using the heater in winter, the A/C switch should be turned off. The A/C switch in a car can be understood as the air conditioning cooling switch. When the A/C light is on, it means the air conditioning compressor is running, which increases engine load and fuel consumption. The heating principle of the heater utilizes the heat generated by the engine itself, which is delivered into the car through the air conditioning ducts without the need for the compressor. Therefore, turning on the A/C in winter does not increase the heating power but instead wastes the compressor's effort unnecessarily.
