Spread out completely
First, the cooling system is short of coolant. Coolant is commonly known as antifreeze. Car air conditioning warm air 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.
Methods of replacing automobile coolant:
1. Before changing the coolant, you must wait 10 minutes after the vehicle is turned off. After driving, the coolant temperature is very high and it is easy to burn.
2. Conduct an all-round inspection of the vehicle: check the pipeline for signs of leakage and cracks, and check the five-way water pipe. If this part of the coolant leaks, replace the water pipe or re-fix the connection according to the situation.
3. Lift the vehicle with a jack.
4. Tighten the screws of the bottom shell of the water tank with a wrench, and connect the old liquid with the waste basin.
5. Cover the expansion box cover with a thick towel, slowly loosen it until the air pressure is exhausted, and then completely remove the box cover. Use a compressed air spray gun or a thick towel to pressurize the water inlet of the expansion tank and remove it from the engine block as much as possible.
6. Add softened water and idle for 5 minutes, so that the inside of the cooling circulation system can be fully cleaned.
7. Add new antifreeze to the upper limit of water level.
8. Run at idle speed for 5 minutes, then observe the scale line of antifreeze tank and fill it up.
Second, the structure of the warm air groove blocking the warm air groove is actually a reduced version of the radiator of the engine water tank. 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.
Third, the thermostat failure The common failure of the thermostat is that it can't be opened, but the reason why the thermostat is not hot due to the thermostat failure 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.
Extended data:
Matters needing attention in turning on air conditioning in the car in winter
1. Under the mode of turning on the internal circulation of the warm air conditioner for a long time, the air inside the car is not fresh, especially the space inside the car is not large, so when turning on the air conditioner in winter, you should pay attention to opening the window regularly for ventilation.
2. When the warm air is turned on in the car, it is best to open the window halfway to allow air to circulate, and turn on the convection mode, which can prevent the car from drying and improve the air quality inside the car.
3. If the engine burns incompletely, it will produce high concentration of carbon monoxide, so don't sleep in a car with warm air.