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Automobile Engine Air Conditioning System Thermal Dissipation Inspection Method Inventory
The poor heat dissipation of the engine and air-conditioning system of the vehicle causes the following kinds of failure phenomena when the water temperature is too high:
1, in the traffic is not smooth - traffic jam or long idle, the engine water temperature indicator is too high, the electronic fan high-speed gear working time is too long, the engine noise increases, the air temperature is too high to open the air conditioner when the fault is most obvious.
2, when the air temperature is too high to open the air-conditioning, the idling speed fluctuations are too large, rapid acceleration and power, the engine has abnormal sound.
3. When the hot car is extinguished for more than ten minutes, it is not easy to start the car when it is started; sometimes the hot car will automatically turn off when it is running.
4, cold air conditioning when the cooling temperature is very cold, hot air conditioning when the cooling effect is not obvious; and the air conditioning system has a large resonance buzzing sound.
5. When the hot car is idling, the clutch of the air conditioner compressor is frequently cut off and even disconnected, causing the hot air-conditioning air-conditioning to not cool.
High engine water temperature solution:
1. After the hot car, check the water return of the return pipe on the top of the antifreeze storage tank. If the return water is not smooth or blocked, the water temperature will be too high.
Warm reminder: Do not blindly disassemble and replace parts during maintenance.
2. Check if there is excessive dust between the condenser and the water tank and thoroughly clean it with high-pressure gas to ensure that the water tank and the condenser have good heat dissipation performance.
Warm reminder: always pay attention to wipe the dust between the condenser and the tank.
3, in the hot car, check the temperature difference between the upper and lower water pipes, if the temperature difference is too large, you need to check the opening of the thermostat and whether the pump has lost the speed of failure.
Warm reminder: The temperature difference between the upper and lower water pipes of the water tank can not be too big.
4. Due to the non-standard addition and replacement of antifreeze, it will cause the engine water channel and water tank to be blocked in advance and the phenomenon of high water temperature will occur. Antifreeze is replaced once every two years, and original parts must be used for replacement and addition.
Warm reminder: After the water is added to the engine cooling system, or the concentration of antifreeze added exceeds 60%, the water temperature will be too high.
5, high pressure in the high pressure side of the air conditioning system is too high; air conditioning refrigerant or air conditioning refrigeration oil filling too much; self-adjustment of the internal self-adjusting air conditioning compressor failure, resulting in high pressure; there is air conditioning condenser plug, The above failures will increase the engine load and consume the cooling performance of the cooling system, leading to the occurrence of high water temperature failures.
Reminder: Air conditioning refrigerant filling too little or too much will reduce the cooling effect.