The thermostat is often turned on or turned on too early, which makes the refrigeration system carry out a big cycle too early and the outside temperature is very low. Especially when the car is driving, the cold air will quickly cool the antifreeze, the engine water temperature will not come up, and the warm air will not be hot. So you can't turn on the thermostat often, and you can't turn on the thermostat too early.
2. The engine cooling system has air resistance.
Air resistance leads to poor circulation of the cooling system, resulting in high water temperature and no warm air. If there is air in the cooling system all the time, it is likely that the cylinder gasket is damaged and air leaks into the cooling system. The cylinder gasket should be replaced in time.
If the inlet pipe of the small heating tank is very hot and the outlet pipe is very cold, this situation should be that the small heating tank is blocked. The small heater water tank should be replaced.
3. The heater water valve is damaged or not fully opened.
The automobile warm water valve is the warm air switch of the automobile heater. The working principle of the automobile heater is that the coolant heated by the engine is pumped into the radiator core of the heater system by the pressure of the water pump, and the heat of the radiator core is sucked into the cab by the blower, so the water valve of the heater should be completely repaired to make it work normally.
4, radiator core failure
The radiator core is installed in the heating system assembly under the instrument panel. Common faults include blockage or leakage of radiator core. Always check whether there is water under the floor. If the engine is often short of water and the temperature is too high, it proves that the radiator core is leaking, and the radiator core should be repaired in time.
Extended data:
Maintenance method of automobile air conditioner
1, select the appropriate air conditioning temperature.
Of course, in summer, many people like to keep the temperature very low. As we all know, too low temperature adjustment will affect your health, so the temperature adjustment of air conditioner must be appropriate. The most suitable temperature for human body is 20℃ to 25℃. If it exceeds 28℃, people will feel sultry. And below 14℃, people will feel cold.
2. Enter the car in summer and start the internal circulation immediately.
Cars are parked in the hot sun for a long time. Some car owners like to turn on the air conditioner and start the internal circulation as soon as they start the car, thinking that this can make the temperature in the compartment drop faster.
But because the temperature inside the car is higher than that outside the car, the effect is not good. When you first enter the car, you should first open the window for ventilation and start the external circulation to exhaust all the hot air. After the temperature in the carriage drops, it is replaced by internal circulation.
It is known that air conditioner should be used in a totally enclosed state.
The same is true for car air conditioners. If the doors and windows are not tightly closed during use, the refrigeration effect will be poor and fuel will be wasted.
4. The direction of the air outlet can be adjusted at will.
Some car owners do not pay attention to adjusting the blowing direction of air conditioner when using air conditioner, which is not conducive to achieving the best effect of air conditioner. According to the principle that the cold air sinks and the hot air rises, the correct way should be that the air outlet is upward when the cold air is turned on and downward when the heating is turned on.
5. Turn on the air conditioner for a long time.
Some car owners always turn on the air conditioner after getting on the bus, but using the air conditioner for a long time will make the condenser pressure too high and cause losses to the refrigeration system, because the air conditioner is a heavy burden to the engine, which is itself a heater, not to mention in high temperature weather.
In this case, some cars with small displacement even have water boiling, which affects driving and reduces the efficiency of air conditioning. Therefore, it should not be too long to use the air conditioner every time. If the temperature inside the car has reached a comfortable temperature, you can turn off the air conditioner and turn it on later.
6. Don't smoke in the air-conditioned car.
Because of smoking in the carriage, the smoke can't be discharged at once, which stimulates the eyes and respiratory system and is not good for the body. If you smoke, you should adjust the air conditioning and ventilation control to the "exhaust" position, so that the smoke in the compartment can be exhausted from the car.
7. Don't rest or sleep for a long time in a parked car with air conditioning.
Because of the good sealing inside the car, once the car stops, the ventilation inside the car is poor. If you turn on the air conditioner to rest or sleep at this time, it is likely that the carbon monoxide gas emitted by the engine will leak into the car, leading to poisoning and even death.
8. Try not to turn on the air conditioner when driving at low speed.
When encountering traffic jam, don't let the engine run at high speed in order to improve the efficiency of air conditioning, because doing so will adversely affect the service life of the engine and air conditioning compressor.
9. Turn off the fire before turning off the air conditioner.
Some car owners often think of turning off the air conditioner after the flameout, which is harmful to the engine, because the engine will start with the load of the air conditioner when the vehicle starts next time, and such a high load will damage the engine. Therefore, after each stop, turn off the air conditioner first and then turn it off. The vehicle starts for two or three minutes, and then turn on the air conditioner after the engine is lubricated.
Baidu encyclopedia-automobile air conditioning system
Baidu encyclopedia-engine cooling system