First of all, if you find that the warm air is not hot when driving, and it will return to normal after driving for a period of time, it is normal, because the warm air is formed by the heat dissipation of the engine, and the temperature of the water tank and engine of the newly started car is still relatively low, so the wind blown out will definitely not be hot.
So, don't turn on the warm air when you get on the bus. This will not only make the temperature inside the car rise rapidly, but will increase the burden on the engine and delay the engine from rising to the normal working temperature. The correct way to turn on the warm air is to start the engine to warm up first, and then turn on the warm air after the engine temperature pointer reaches the middle position.
But if the warm air is not hot all the time, you need to pay attention. This should be a problem with the heating system of the car. However, the system structure of automobile air conditioning heater is very simple, and the reasons can be found by checking the following aspects.
Schematic diagram of automobile warm air principle:
First, the air conditioning filter element is too dirty and blocked.
According to the principle of simplicity first and complexity later, if you find that the warm air is not hot, you should first think about whether the air conditioning filter element has not been replaced for a long time. This is the simplest point that many car owners easily overlook, because if the air conditioning filter element is dirty and blocked, it will lead to much less wind and affect the heating effect of the warm air. For example, playing second gear will be very warm. Now the hot air blown out is smaller, and it will certainly not be as warm as before.
Second, the coolant is insufficient.
Insufficient antifreeze will also affect air conditioning and heating. Because antifreeze is not only an essential medium for cooling the engine, but also a heat-conducting medium for heating the automobile air conditioner, the antifreeze that absorbs the heat of the engine will heat the heater box after entering the heater box, and the wind will be blown out into hot air through the heater box. If we don't have enough antifreeze, the amount of water flowing into the small warm air tank will become smaller, the heat in the warm air tank will be insufficient, and the wind blown out will naturally be less hot.
Therefore, we should check the coolant regularly. If it is found that the coolant is less than the minimum scale value (the normal capacity of antifreeze coolant should be between min and MAX), it should be added in time, otherwise it will affect the cooling efficiency of the engine.
Third, the heater tank is blocked.
Similarly, if the heating box is blocked, antifreeze cannot enter the heating box, or the flow rate becomes smaller, it will also affect the heating of the air conditioner. In addition, if this thing is broken, it will be more troublesome to maintain, and most people can't handle it, because it needs to remove the whole instrument panel to find it. It also needs to clean the heater water tank, the radiator of the water tank and replace all the coolant to completely solve this fault.
Four, thermostat failure
In addition to the above three common problems, thermostat failure may also affect air conditioning heating. As we all know, the thermostat is a tool for automatically adjusting the temperature, which is similar to the valve of our faucet. By changing the circulation range of water through the valve, the refrigeration capacity of the cooling system is adjusted, and the engine is ensured to work in a suitable temperature range. And if the thermostat fails, the main valve can't be opened, and the antifreeze can't dissipate heat through the water tank, which will lead to overheating of the engine.
On the contrary, if the main valve is not closed, it is always open, and the water tank constantly emits antifreeze, which will cause the engine water temperature to be low, the warm air temperature to be not hot enough or the heating time to be prolonged. In addition, if the engine water temperature is low for a long time and cannot reach the optimal working temperature, it will also lead to problems such as high fuel consumption and increased wear. Therefore, if the engine water temperature is found to be low for a long time, you must go back to the store for maintenance and inspection as soon as possible.
The final conclusion is that the heating system of automobile air conditioner is simple in structure, mature and reliable in technology, and the probability of problems is actually relatively low. In case the heating system is not hot, we don't have to be nervous. We can solve the problem by checking the above situation step by step.