Inspection and Maintenance of Special Vehicle Cooling System

The most common fault in a dedicated automotive cooling system is the “water tank pan” that causes the car to drop anchor and lose water. Accompanied by the tank boiling and depletion, there are acceleration and power failure. To overhaul the tanks, the first thing to do is to ensure that other relevant parts of the vehicle are normal, such as using the correct number of fuel, oil, spark plugs, and antifreeze, and adjusting ignition timing and idling air-fuel ratio. The cooling system is further checked with these aspects normal.

Look at the tank first. Normal water tanks should have the same temperature from top to bottom when the special-purpose vehicle is running. If there is a half-sided half heat, it can be used to determine the internal clogging of the tank. The tank can be connected to a 2 kilogram pressure water pipe and flushed backwards. If the blockage is severe, a small amount of cleaning agent can be used. At the same time, pay attention to the dirt of the cleaning tank and observe whether there is any leakage.

Next, look at the thermostat. Some people think that removing the thermostat can prevent the water temperature from being too high. In fact, the special thermostat does not cause the water temperature to be too high as long as it functions normally. It is very harmful for the engine to operate at low temperatures for a long time. In addition, many engine festivals are also very harmful. The thermostat acts in both directions. When the thermostat is closed, the cooling water is forced to go through a small cycle. When the thermostat is opened, the small cycle is closed and the cooling water goes through a large cycle. If the thermostat is not installed, due to the throttling effect of the local resistance of the pipeline, the actual flow to the large circulation is very little water, and the water temperature rises instead.

Finally check the pump. There are three ways to damage the pump: leakage, lost rotation and impeller corrosion. The so-called discarding is that the clearance between the pump shaft and the impeller is too large. When the engine speed reaches a certain value, the pump impeller cannot reach the corresponding rotation speed, resulting in poor water circulation. The fan is the main component of the cooling system. Some cars have eliminated the fixed fan and replaced it with an electromagnetic and fan with a silicone oil clutch. Its characteristic is that the fan basically does not work when the cold car, but the heat dissipation when the hot car reaches the maximum; the main fault of the silicone oil fan clutch is the oil leakage, and the main fault of the electromagnetic fan clutch is water temperature switch damage, line damage, electromagnetic coil damage . In addition to cooling the engine as a cooling medium, some of the heat can also dissipate with the exhaust. The engine oil can also take away some of the heat, and the air convection around the engine plays an irreplaceable role. Therefore, do not forget to check when the engine overheats. Exhaust systems (especially those with catalytic converters) are smooth, and the oil and transmission oil heat sinks are intact. In addition, the wind deflector (commonly referred to as the air ring) near the engine fan of a special-purpose automobile plays a crucial role in the heat convection in the cabin. Attention should be paid when checking.

In order to prevent the failure of the cooling system, attention should be paid to the maintenance of the cooling system. The maintenance of the cooling system includes:

1. Check the sealing condition of the cooling system, the tightness of the fan belt, the sensitivity of the thermostat and the cooling water temperature, etc. and pay attention to maintaining sufficient cooling water.

2. The cleaning and cooling system includes scale attached to the radiator and water jacket to prevent the scale from affecting the cooling performance of the cooling system.

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