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.
Solution: You can see the location of the warm water tank from the inside of the engine compartment. In some models, the position of the heater tank will be higher than the cylinder block, and it will be the same as or higher than the cylinder head, so as to ensure that the coolant will circulate in the cylinder block and the cylinder head first when the coolant is insufficient. After the coolant is replenished, the warm air tank will be filled with boiling coolant, and the warm air will naturally heat up.
2. The heater water tank is blocked
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.
Solution: Once the heater 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, thermostat failure
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.
Solution: If the water temperature is low for a long time due to the failure of the thermostat, you can go to the repair shop for maintenance and inspection immediately.
4, warm water valve failure
After the hot water valve fails, the opening of the electronic control valve is no longer controlled by the computer, and it is in the state of normally open, normally closed or fixed position. At this time, there is no coolant flowing through the warm water tank or the flow rate is uncontrolled, so the warm air temperature of the air conditioner is naturally uncontrolled.
Solution: A warm water valve is installed between the water inlet pipe of the warm water tank and the small circulation pipeline of the engine, and the opening of the valve is controlled by the air conditioning computer, so as to control the coolant flow into the warm water tank and achieve the purpose of controlling the warm air temperature of the air conditioner more accurately. Therefore, the slow temperature rise caused by the failure of the warm water valve also needs to go to the repair shop for inspection.
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Matters needing attention in the use of automobile warm air
1, don't press the AC key when turning on the warm air, because this key is the compressor start key. The correct way is to blow out warm air as long as the air volume is adjusted.
2. In winter, the temperature of water tank is low, and the warm air is turned on just after the engine is started, which will inevitably increase the burden on the engine and delay the rise of water temperature. Therefore, warm air should be used after the water temperature pointer reaches the middle position or the blue indicator goes out.
3, waiting in the car in winter, it is really unbearable not to open the warm air, but parking for a long time is easy to cause carbon monoxide poisoning, especially sleeping in the car, which is a very dangerous behavior. If you need to turn on the warm air for a long time, leave a certain ventilation gap in the window to ensure the air circulation in the car. Especially in the position above the head, the gap is slightly larger and safer.