My car is the star of Chang 'an. The second generation warm wind is not hot, but the cold wind blows. Why?

There are two reasons why the vehicle heating system is not hot or there is no warm air: one is caused by the engine cooling system, and the other is caused by the poor operation of the heating control mechanism. Check the temperature of the two inlet pipes of the small heating water tank. If both pipes are hot enough, there is something wrong with the air volume control mechanism. On the contrary, if both water pipes are cold, or one is hot and the other is cold, it is a problem with the cooling system. You have to check it carefully to know that there is something wrong with the car. Ask the car master. 4S shop professional technician, 10 minutes to solve.