16 MG What happened to the Ruiteng fan?

Hello, dear. It was normal before the antifreeze was changed, and the fan kept turning after the antifreeze was changed. The problem is simple, that is, the air in the cooling system is not completely exhausted. Exhaust air from the new cooling system. Oh, that's normal. In a word, the air is still not clean. Think about it, your car was normal before the antifreeze was changed, but the fan was not normal after the antifreeze was changed. This phenomenon is that the air is not completely exhausted. Normal exhaust requires a professional vacuum pump. First, the air in the cooling system is exhausted, and then antifreeze is added. In the absence of a vacuum pump, a part of air can be discharged from the outlet pipe of the warm air pipe first, then the engine is started to warm up for about fifteen minutes, and then the remaining air is discharged from the coolant temperature sensor. After exhausting, start the engine to make it run normally, then wait until the temperature of the upper and lower water pipes is the same, and the cooling fan will stop automatically after running.