Causes and treatment of poor heat dissipation of t

Causes and diagnosis and treatment of poor engine heat dissipation

symptoms: 5 diseases caused by high water temperature

poor heat dissipation of engine and air conditioning system, resulting in high water temperature, the following faults will occur:

1 In case of poor traffic, traffic jam or long-term idling, the display of the engine water temperature gauge is too high, the working time of the high-speed gear of the electronic fan is too long, the engine noise increases, the temperature is too high, and the fault is most obvious when the air conditioner is turned on

2. When the temperature is too high and the air conditioner is turned on, the idle speed is unstable, the speed fluctuates too much, the rapid acceleration is weak, and the engine makes abnormal noise

3. It is not easy to start the hot car when it is started after the hot car stalls for more than ten minutes; When the hot car is running, sometimes the main engine 1) peak power of power supply: ≤ 10 kW (including peripheral installation such as cooling and high temperature installation); Automatic flameout

4. Cold car space-time modulation cold temperature is very cold, hot car space-time modulation cold effect is not obvious; And there is a large resonance buzzing sound in the air conditioning system

5. When the hot car idles, the clutch of the air conditioning compressor is frequently sucked off, or even disconnected, resulting in the non refrigeration of the hot car air conditioner

prescription: suit the medicine to the case and fully recover

1 Check whether there is too much dust between the condenser and the water tank with excellent performance price ratio and reliable quality, and thoroughly clean it with high-pressure gas to ensure that the water tank and the condenser have good heat dissipation performance

warm reminder: pay attention to wipe the dust between the condenser and the water tank at ordinary times

2. When the vehicle is hot, check the temperature difference between the upper and lower water pipes of the water tank. If the temperature difference is too large, check the opening of the thermostat and whether the water pump has the fault of speed loss

warm reminder: the temperature difference between the upper and lower pipes of the water tank should not be too large

3. After hot driving, check the return water condition of the return pipe at the upper end of the antifreeze water storage tank. If the return water is blocked or blocked, the water temperature will be too high

warm reminder: do not disassemble and replace parts blindly in maintenance

. Due to the nonstandard addition and replacement of antifreeze, the engine water channel and water tank will be blocked in advance, resulting in high water temperature. The antifreeze is replaced every two years, and the original accessories must be used when replacing and adding. Warm reminder: after adding water into the engine cooling system, or the concentration of antifreeze added exceeds 60%, the water temperature will be too high

5. The high pressure at the high pressure end of the air conditioning system is too high; Excessive filling of air conditioning refrigerant or air conditioning refrigeration lubricating oil; The self-adjusting function of the internal self-adjusting air conditioning compressor fails, resulting in high pressure; There is also the blockage of the air conditioning condenser. The above failures will increase the load of the engine, consume the heat dissipation performance of the cooling system, and lead to the failure of too high water temperature

warm reminder: too little or too much refrigerant will reduce the refrigeration effect

doctor Che's quotations: five warning signals to judge the patient

when you drive the car to the repair shop and describe the decline or problems of the car's performance to the repairman, you should pay attention to the related noise and symptoms. It can be said that the more you know about cars, the better you can describe car faults and help repairmen make correct diagnosis, so as to suit the remedy to the case

1. New or abnormal noise is usually an indication of vehicle failure. For example, the low buzzing sound may be the fault of the bearing, or it may be just the problem of a tire; The scream may indicate the need to replace the brake pads or a loose belt. When describing the fault, it is best to clearly explain the cause or action of the noise

2 In addition to the loss of performance or noise, the indication signal on the instrument panel is another place that cannot be ignored. Read the user manual of the car carefully to understand the meaning of all kinds of letters and general plastic with small tonnage lights, which can help you find new faults in time

3. If you feel the steering wheel tightening, the car leaning to one side, or abnormal vibration within a certain speed range when driving, you need to check the tires, or balance and position the wheels. When these problems are just discovered, timely maintenance can prevent the continuous expansion of the fault and avoid greater losses

4. Pay attention to whether the car starts smoothly. If the car starts to become difficult to start, it's best to drive to the maintenance plant in time for maintenance