Why does the car warm water tank have the sound of water flow?

There are many reasons for the sound of water flowing in the car heater water tank, as follows: 1. There is air in the pipeline, or there is blockage in the heater. In this case, you need to go to the 4S shop for inspection and maintenance according to the situation. 2. Heat the water tank to circulate the coolant in the car. It is normal. If there is no water leakage, there will be no problem with the heater. 3. Insufficient coolant. Need to fill the coolant in time. When filling antifreeze, please don't do it when the engine is overheated; Otherwise, if you open the cover of the antifreeze tank, you may get burnt. Try not to mix antifreeze, because different antifreeze costs are different; The antifreeze does not need to be mixed with water unless it is concentrated antifreeze.