In fact, if you use heating, you don't need to turn on the air conditioner switch, because the air conditioner button is also commonly known as: turn on the air conditioner. That heating belongs to the energy cycle in the car, which leads the heat in the cooling water tank to the car, which is regarded as waste utilization.
The correct way is to start the engine for preheating first, and then turn on the heating and air conditioning after the engine temperature pointer reaches the middle position. At the same time, set the air circulation to external circulation, let the cold air in the car be discharged outside the car, wait for 2~3 minutes, and then set the air circulation to internal circulation.
After heating the car, you should pay attention to several matters. First, warm air is not suitable for blowing directly on the head, which will cause driver fatigue and affect driving safety for a long time. Therefore, it is suggested that under the condition of using heating for a long time, open the window seam to make the air circulate, so as to ensure the oxygen content of the air in the car and make the driver clear-headed.
After heating, the car is a closed space, which brings a good environment for the growth and spread of bacteria. If someone smokes in the car at this time, the amine and nicotine in the smoke will adhere to the surface of the evaporator. When the air conditioner is not commonly used and it is rainy, bacteria will spread on the evaporator surface, and turning on the air conditioner again will cause vehicle air pollution.