Correct use of ac key First of all, the A/C key controls the switch of the air conditioner compressor. Even in summer, when the owner turns on the air conditioner, he needs to turn on the A/C button at the same time, so that the air conditioner will be cooled and the air conditioner will be sent into the car to realize the cold circulation in the car. The owner can turn off the air-conditioning switch when starting or accelerating rapidly, because the air-conditioning compressor also needs the engine to drive, so it will consume part of the power of the automobile engine. After turning off the air-conditioning switch, the engine power shortage can be avoided. Do I need to turn on the air conditioner to turn on the hot air? Do I need to turn on the air conditioner to turn on the hot air? Some novice drivers may think that air conditioning is turned on in summer and in winter. In fact, this is not correct. In fact, when the warm air is turned on in winter, the owner does not need to turn on the air conditioner switch. The host can understand the air conditioning switch as a key to refrigeration, and let him know that he doesn't need to turn on the warm air in the future. Because warm air is sent into the car by the heat of the engine of the car, the heat circulation in the car can be realized by blowing air, which can increase the temperature in the car. If the air conditioner switch is turned on when the warm air is turned on, the compressor will work, which will not only make the heating effect in the car very good, but also increase fuel consumption.