1. Do not use the air conditioner for a long time. The principle of internal circulation is that the air circulates in the closed space inside the car, which causes the oxygen content in the car to decrease continuously. Moreover, if the gasoline in the cylinder is not completely burned, the unburned carbon monoxide of the engine may leak into the car. Therefore, the air quality in the car will be worse and worse, and even harm the human body. Therefore, the internal circulation cannot be operated for a long time. It's the same reason that you can't sleep in the car with an internal circulation.

2. Don't start the car under the scorching sun. Turn on the air conditioner immediately. In summer, many cars have the experience of being exposed to the sun. Even if they are sometimes parked in a cool place, it is difficult to escape the baking of the sultry air. When you open the door and get into the car, it is absolutely hotter inside than outside. Many people will start the car immediately, turn on the air conditioner and increase the wind speed to achieve the fastest cooling effect. In fact, this is not reasonable. The correct cooling method is to put down the glass on both sides after starting the car, and let the air convection outside the car first. This can not only reduce the temperature inside the car quickly, but also effectively reduce the load of the air conditioner during subsequent cooling. After three minutes, the engine speed will be stable, then the window will be folded up and the air conditioner will be turned on, so that the engine will not be damaged.

3. Do not idle the air conditioner for a long time. Using automobile air conditioner at idle speed for a long time will have adverse effects on the engine cooling system, battery system and the whole air conditioning system. At this time, if you can make sure that the waiting time is very long, you'd better turn off the air conditioner, put down the window or leave the car after flameout. This not only saves fuel consumption, but also extends the service life of the air conditioner.