Pacific Automotive Network If there is insufficient coolant or the water tank is clogged, a cavity will be formed inside the heater water tank, and the coolant will flow through and hit the wall of the water tank, causing a running sound. At this time, you can first recall whether you have added tap water before. If you have added it, it is likely that the water tank is clogged. This is more troublesome. You need to dismantle the heater water tank for repair. If you have not added tap water, it is basically because air has entered the heater water tank. At this time You can turn on the heater and start the engine to exhaust the cooling system.
The sound of running water after the car is started is also a difficult disease. Because the car itself has a lot of liquid working fluids, first of all, it is difficult to determine the source of the noise. Secondly, even if the source of the noise is found, sometimes there will be excessive repairs. Situation, money is wasted, today I will talk about the common causes of running water sound.
1. A gurgling sound like a straw inserted into the water and blowing air. The most common sound of the power steering pump is the expansion water bottle and the mechanical hydraulic power pump. There are two common situations when the hydraulic power pump makes this sound. One is It is the booster oil leaking. Many old cars are prone to leakage of booster oil. When the oil is low and mixed with air, it will make this sound. At this time, replenishing the booster oil can basically solve the problem. Another situation is that the air is not completely exhausted. The solution is also very simple. Open the booster oil filling cap, then start the car, hit the direction left and right on the spot, repeat several times, and observe the booster oil level at the same time. If it is insufficient, add it in time. Basically The problem can be solved, and there is no need to replace the booster pump at this time.
The other is the sound of an expansion kettle. This is a common pressure expansion kettle. The lower end of the kettle is directly connected to the cooling system. There is a pressure valve on the lid to maintain the pressure of the cooling system. When the pressure valve When it fails, the coolant will flow into the expansion kettle driven by the water pump, making a bubbling sound. If this happens, you can first bleed the cooling system, and then press the pressure valve of the kettle lid tightly to maintain the pressure. If the sound disappears, then The pressure valve or the pot lid is not sealing well. If it can be repaired, repair it. If it cannot be repaired, just replace the pot lid.
2. The sound of water flowing. This kind of sound is common in the heater water tank, because it is difficult to make the sound of running water from the cooling water channel inside the engine. Firstly, the sound is basically covered by the sound of water flow when the engine is running. It is basically difficult to hear it when sitting in the cockpit. Secondly, There is basically no air in the engine's internal cooling system. The coolant flows close to the cooling system pipes without water impact, so it is difficult to make the sound of running water. Only when the large circulation is turned on, you may hear a little bit from the radiator, but this must be when the hot car thermostat is open. If the cold car is started, it is basically a problem with the heater water tank, because it is located on the instrument panel. Below the platform, farther away from the engine and closer to the cockpit, the sound is more pronounced.