Audi q5 warm air comes up slowly, the water temperature has reached 9 degrees, and it takes about 2 minutes to heat up. What's the matter?

1. The temperature rises very slowly. Under normal conditions, there are the following situations

1. If the thermostat is often turned on or turned on too early, the cooling system will have a large cycle. If the outside temperature is low, especially when the vehicle is running, the cold wind will quickly cool the antifreeze, and if the water temperature does not rise, the warm wind will not be hot.

2. The impeller of the water pump is damaged and lost, so that 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, resulting in high water temperature, which also leads to the warm air not being hot.

2. The following points should be done in daily use and maintenance

1. The air-conditioning filter should be replaced regularly, especially in the windy and dusty north, which will affect the use effect of the filter.

2. Check the refrigerant liquid level regularly. The most common and simple method is to check with the peephole of the dryer. If the oil level is too low, add it in time.

3. When the condenser is installed on the windward side, there are often many foreign bodies such as dust, dirt and leaves, which 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. can easily shorten the service life of the air-conditioning hose. Replace the air-conditioning hose regularly, and check the air-conditioning hose and pipe joint regularly for oil stains.

5. The conduit of the evaporator should be clean, and the blower should be ensured to operate normally, and the drain pipe should be kept clean and unblocked, so as to ensure that the condensed water can be discharged in time.

Third, the method of raising the temperature inside the car

1. Warm up the car before turning on the warm air: In winter, start the engine to warm up first, turn on the warm air conditioner after the engine temperature pointer reaches the middle position, and set the air circulation as external circulation, so that the cold air inside the car can be excluded from the car, wait for about 2 minutes, and then set the air circulation as internal circulation, so that the temperature inside the car can rise rapidly.

2. Proper use of natural wind: The temperature should be set first, then the OFF key should be pressed, and external circulation should be used. At this time, all the displays on the screen disappeared, but the heating continued to be sent out. The faster the speed, the more sufficient the heating.

3. Use automatic air conditioning: For mid-to-high-class cars, it will be easier to use automatic air conditioning for heating, and the vehicle does not need to be preheated, so the heating will come faster. The only disadvantage: it will increase fuel consumption to some extent because of opening the air conditioner compressor.

Extended information:

State judgment

When the engine starts cold running, if there is still cooling water flowing out from the water inlet pipe of the water tank, it means that the main valve of the thermostat cannot be closed; When the engine cooling water temperature exceeds 7℃, there is no cooling water flowing out of the water inlet pipe of the water tank, which means that the main valve of the thermostat can not be opened normally, so it needs to be repaired. Check the thermostat in the car, and the methods are as follows:

1. Check after the engine starts: Open the radiator filler cap. If the cooling water in the radiator is calm, it indicates that the thermostat works normally, otherwise, it indicates that the thermostat works abnormally. This is because, when the water temperature is lower than 7℃, the expansion cylinder of the thermostat is in a contracting state and the main valve is closed; When the water temperature is higher than 8℃, the expansion cylinder expands, the main valve gradually opens, and the circulating water in the radiator begins to flow.

when the water temperature meter indicates that it is below 7℃, if there is water flowing at the water inlet pipe of the radiator and the water temperature is warm, it means that the main valve of the thermostat is not closed tightly, which makes the cooling water circulate too early.

2. Check after the water temperature rises: at the initial stage of engine operation, the water temperature rises rapidly; When the water temperature meter indicates 8, the heating rate slows down, which indicates that the thermostat is working normally. On the other hand, if the water temperature keeps rising rapidly, when the internal pressure reaches a certain level, the boiling water suddenly overflows, which indicates that the main valve is stuck and suddenly opens.

when the water temperature meter indicates 7℃-8℃, turn on the radiator cover and radiator drain switch, and feel the water temperature. If both of them are hot, it means that the thermostat works normally; If the water temperature at the radiator water inlet is low, and there is no water outflow or little running water at the radiator water inlet, it means that the thermostat main valve cannot be opened.

the thermostat that is stuck or not closed properly should be removed for cleaning or repair, and it should not be used at will.

Reference: Baidu Encyclopedia-Thermostat