1. If the thermostat is often opened or opened too early, the cooling system will have a great cycle. If the outside temperature is low, especially when the vehicle is driving, the cold air will quickly cool the antifreeze, and the water temperature will not be hot until the warm air comes up.
2. The impeller of the water pump is damaged and lost, so the flow through the warm air small water tank is not enough, and the heat will naturally not come up.
3. The air resistance of the engine leads to poor circulation of the cooling system, which leads to high water temperature, and also leads to the warm air not being hot.
Second, in daily use and maintenance should do the following.
1, air conditioning filter should be replaced regularly, especially in the north, which will affect the use effect of the filter.
2. Check the refrigerant level regularly. The most common and simplest method is to check with the peephole of the dryer. If the oil level is too low, it should be added in time.
3. When the condenser is installed on the windward side, there are often many foreign objects such as dust, dirt and leaves. These foreign matters will reduce the working effect of the condenser for a long time, so it should be cleaned regularly.
4, high temperature, corrosion, vibration, impact, etc. It is easy to shorten the service life of air conditioning hose. Replace the air conditioning system hose regularly, and regularly check the air conditioning system hose and pipe joint for oil stains.
5, evaporator air duct to clean, but also to ensure the normal operation of the blower, drain pipe to keep clean, smooth, to ensure the timely discharge of condensed water.
Third, the method of improving the temperature inside the car
1. Warm up the car first and then turn on the warm air: in winter, start the engine to warm up, turn on the warm air conditioner after the engine temperature pointer reaches the middle position, and set the air circulation to external circulation, so that the cold air in the car can be discharged to the outside, wait for about 2 minutes, and then set the air circulation to internal circulation, so that the temperature in the car can rise rapidly.
2. Correct use of natural wind: For natural wind heating, set the temperature first, then press the OFF key to use external circulation. At this time, all the displays on the screen disappeared, but the heating continued to be emitted. The faster the speed, the more sufficient the heating.
3, the use of automatic air conditioning: for mid-to high-end cars, it will be easier to use automatic air conditioning heating, vehicles do not need to preheat, heating will come faster. The only disadvantage: it will increase fuel consumption to a certain extent because of opening the air conditioning compressor.
Extended data:
State judgment
When the engine starts to run cold, if there is still cooling water flowing out of the water tank inlet pipe, it means that the thermostat main valve cannot be closed; When the engine cooling water temperature exceeds 70℃, there is no cooling water flowing out of the water tank inlet pipe, indicating that the main valve of the thermostat cannot be opened normally and needs maintenance. The thermostat in the vehicle can be checked as follows:
1. Inspection after engine starting: Open radiator filler cap. If the cooling water in the radiator is calm, it means that the thermostat works normally; Otherwise, the thermostat is not working properly. This is because when the water temperature is lower than 70℃, the expansion cylinder of the thermostat is in a contracting state and the main valve is closed. When the water temperature is higher than 80℃, the expansion cylinder expands, the main valve gradually opens, and the circulating water in the radiator begins to flow.
When the temperature indicated by the water thermometer is below 70℃, if there is water flowing through the water inlet pipe of the radiator and the water temperature is warmer, it means that the main valve of the thermostat is not closed tightly and the cooling water circulates prematurely.
2. Inspection after the water temperature rises: At the initial stage of engine operation, the water temperature rises rapidly; When the water temperature meter indicates 80, the heating rate slows down, indicating that the thermostat is working normally. On the other hand, if the water temperature continues to rise rapidly, when the internal pressure reaches a certain level, the boiling water suddenly overflows, indicating that the main valve is stuck and suddenly opens.
When the water temperature meter indicates 70℃-80℃, open the radiator cover and radiator drain switch, and feel the water temperature by hand. If they are all hot, the thermostat works normally. If the water temperature at the radiator inlet is low, there is no water flowing out of the radiator inlet or a small amount of running water, indicating that the main valve of the thermostat cannot be opened.
The temperature controller that is stuck or not closed correctly should be removed, cleaned or repaired, and cannot be used casually.
References:
Baidu encyclopedia-thermostat