1. Replace the cooling system without coolant.
Coolant, commonly known as antifreeze, comes from this, and its principle is different from that of household air conditioning heating. Automobile warm air circulation is to connect a pipeline in parallel in the small circulation pipeline of engine coolant, which is connected with a warm air water tank, and the blower blows the warm air water tank to generate warm air, which is how the air conditioning warm air comes from. The lack of coolant in the cooling system is the most common and easily solved fault phenomenon that causes the warm air not to be hot.
When designing the engine cooling system, engineers will give priority to engine heat dissipation, and then the warm air can work normally. When the coolant is insufficient, the coolant will circulate in the engine first. At this time, there is no "water" in the warm air circulation pipeline, and most of the warm air tank is gas. At this time, the air conditioning warm air is naturally not hot.
2. Clean up the blockage of the warm air tank.
The structure of the warm air water tank is actually a miniature version of the radiator of the engine water tank, and there are many small cooling pipes in it, which are as easy to block as the radiator of the water tank. After the inside of the warm air water tank is blocked, the coolant flows slowly, the flow rate becomes smaller, and the heat is insufficient, so the air conditioner warm air is naturally not hot.
The blockage of the warm air water tank has no effect on the heat dissipation of the engine (because they are connected in parallel). The reason for this situation is that the coolant contains too much scale, impurities, flocs and so on. These impurities are caused by careless maintenance. When adding coolant, replace them with water or other brands of coolant.
In addition, once the warm air water tank is found to be blocked, the radiator of the engine water tank will also be partially blocked (both have the same internal structure and circulate the same coolant). Clean the inside of the warm air water tank, the inside of the radiator of the water tank and replace all the coolant, so as to completely eradicate the fault.
3. Maintain the thermostat
The common fault of the thermostat is that it can't be opened, but the reason why the warm air is not hot due to the thermostat fault is that the thermostat can't be closed, commonly known as the thermostat is always open. After the thermostat is normally open, the coolant begins to circulate from the idle speed of the engine. If the water temperature is low for a long time in winter in the north, the air conditioning warm air is naturally not hot. It is obvious from the thermometer that the pointer is obviously lower than the normal scale.
In addition, long-term low water temperature of the engine will lead to high fuel consumption and increased wear (the engine is not working at the optimal temperature), so it is necessary to carry out maintenance and inspection immediately when the water temperature is low for a long time.
Extended data:
Use, maintenance and maintenance of air conditioners
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.
Therefore, the air conditioner should control the temperature inside the car between 18℃ and 25℃. Too low a temperature can easily make people sick. Start the internal circulation immediately after entering the car in summer. 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.
Baidu encyclopedia-automobile air conditioning