Cooling knowledge

　　Common faults of the cooling system are coolant leakage, engine temperature is too high, too low, and engine temperature rises slowly.

1.Coolant leak

　　Common faults of the cooling system are coolant leakage, engine temperature is too high, too low, and engine temperature rises slowly.

1.Coolant leak

　(1) Failure phenomenon: Generally, the cooling system of the engine is fully enclosed. Under normal circumstances, the coolant does not need to be added frequently. If the coolant level drops quickly, it indicates that the cooling system has a leakage failure.
(2)cause of issuer;heat sinkCover andGasketdamage.Damage to the radiator cover and its gasket will damage the seal of the cooling system. When the engine is working, the coolant will evaporate and escape orcarShaking causes loss of coolant spillage. In order to check whether the radiator cover is sealed, a pressure check of the radiator cover can be performed.

　　External leakage; because the coolant is colored with dye, it is easy to see the leakage site.Common leakage points are hoses, hose joints, radiator cores andWater pumpAnd other parts.
　　 Internal leakage; if the coolant leaks from the cooling system into the engine, check whether the cylinder head bolts are tightened, whether the cylinder head gasket is sealed, whether the cylinder head is warped, whether the cylinder head and cylinder block are broken.

2.Engine temperature is too high
(1) Trouble phenomenon: the coolant temperature warning light flashes or the water temperature gauge pointer is in the red zone for a long time, the coolant is boiling and steam appears; in the above situation, the engine power is insufficient.N9RA;
(2)cause of issue; The reasons for the cooling system that cause the engine to overheat are: insufficient amount of coolant, water pump damage, blockage or damage of coolant pump, radiator or cylinder body water jacket is scaled and blocked, which reduces the cooling effect of coolant..
　　ThermostatFailure, stuck or blocked; the thermostat cannot be opened normally, and the coolant cannot flow through the radiator. Whether the thermostat can work normally can be determined by experiment, and its performance should meet the technical regulations.
　　 heat sinkfanMotor or radiator dual temperatureThermal switcherror occured. The damage of the temperature control fan can not work normally, thus causing the engine to overheat.
Causes of engine overheating caused by non-cooling system failures: overloading, driving time in low gear for too long, and premature or late ignition will cause the engine to overheat. Therefore, if necessary, the ignition advance angle should be checked and adjusted. The mixture is too rich or too lean, too much carbon deposits in the combustion chamber, etc. will also cause the engine to overheat.

Automobile operating conditions such as climate, wind direction, road, load and other factors also affect engine temperature.qS#

3.The engine temperature is over,The slow temperature rise of the engine will cause the engine to work for a long time at low temperatures, which will result in accelerated engine wear.
(1) Trouble phenomenon: the engine is running weak, the engine oil consumption increases, the engine works for a long time or the whole working time, the cooling water temperature does not reach the normal working temperature range, and is lower thanvalue="85" HasSpace="False" Negative="False" NumberType="1" TCSC="0" w:st="on">85°C. This fault phenomenon mostly occurs in cold areas or driving in winter.,

(2)cause of issue;The thermostat fails and is stuck in the fully open position. The coolant also circulates in a low temperature state; the radiator fan motor fails, and the fan motor can onlyIIFile operation; water temperature gauge or water temperaturesensorFailure; the ambient temperature is too low and driving against the wind.

　　(3) Fault diagnosis and elimination;Check whether the working status of the radiator fan motor is normal;When the engine is started, check whether the temperature of the outlet pipe of the radiator and the outlet pipe of the heater radiator are the same. If it is the same, it means that the thermostat is normally open, and the cooling system directly enters the large cycle; check the engine coolant, and add it if it is lacking.

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