The water temperature of the car came up. What happened to the warm air?

Whether it is winter or hot summer, we always use air conditioning. Especially in the cold winter, turning on the warm air can adjust the interior of the car to a comfortable temperature. Today we will talk about the problem of insufficient heating in the car. First of all, let's briefly talk about the principle of air conditioning warm air. Unlike air conditioning refrigeration, warm air is completed by the heat of engine antifreeze. That is, the antifreeze circulating in the engine enters the small water tank in the evaporation box of the air conditioner through the pipeline, flow valve and circulation valve. After the blower is running, the air flows to the small water tank. Because of the heat, the air becomes hot, so it can be blown out through the air conditioner outlet. In this process, many electronic and mechanical components, such as air conditioning outlet sensor, evaporation box temperature sensor, flow valve, circulation valve, water temperature sensor, regulating device and so on. , may also take part in the work. If there is no warm air in the car, we need to first determine whether the following air conditioning outlets are out of the air to cool down. If there is no wind, it may be that the blower is damaged, or the air conditioning filter element is dirty and blocked, or the damper motor is damaged, or the damper is stuck. Another situation is that there is wind at the air outlet, but it is not hot air. If the warm air is not hot, there is no need for complicated judgment: first check whether the engine water temperature is normal. If it has been in a low temperature state and does not reach the working temperature, the warm air will definitely not be hot. At this time, we can focus on whether the thermostat has been in a state of large cycle, or whether the signal of the water temperature sensor is true. Just repair or replace the original fault problem. Second, we should focus on whether there is a big temperature difference between the inlet and outlet pipes in front of the heating water tank. If this happens, the heating water tank must be blocked and needs to be disassembled, dismantled or replaced. Thirdly, it depends on whether the flow rate and temperature of antifreeze entering the warm air water tank meet the requirements. The temperature is measured by infrared thermometer, and the comprehensive judgment is made by storing the diagnostic data and fault problems of the tester. Often the water pump is lost or damaged, and the warm air flow valve and antifreeze circulation valve are damaged. Fourth, it depends on whether the antifreeze system has air resistance. It is often encountered that there is no exhaust after replacing antifreeze. The special cylinder gasket is damaged. It can be further determined by standard anti-freezing exhaust method.