What happened to Mercedes-Benz warm air? What is the reason?

When the temperature is low, car owners often ask if the warm air is hot. Some people have heating when the heating is up to the maximum, some people are not very strong, and some people have no heating at all, all of which are natural winds. Today we will briefly summarize these questions about whether the warm air is hot or not. I hope it works for you. Let's briefly understand the working principle of your heating system: the engine generates heat and the coolant is heated to cool the engine. When the engine reaches a certain temperature, ACC control module will control the air conditioning water valve to open, and then the heated coolant will enter the heating water tank through the water pipe. The heating water tank will transfer heat to the passing air, and then the blower will blow the heated air into the car, thus realizing the heating function in the car. As can be seen from the principle, the heating function can be divided into two parts: first, whether the cooling liquid is sufficient and whether the circulation is smooth; Second, whether the relevant control systems and components are running well, so the main reasons why the warm air is not hot are as follows: 1. The coolant is reduced, or the coolant flowing through the heater box is reduced because the water pump is idling. 2. The thermostat is always turned on or turned on too early, which causes the water temperature to be too low and the heater can't work. 3. There is too much air in the coolant, which forms an air lock and affects the circulation. 4. The heating water tank is blocked, so that the cooling liquid flowing inside is less and less, and the heat energy transferred to the air is insufficient. If there is something wrong with the water valve of the air conditioner, it can't be opened or turned down, then there is less coolant that can be used to heat the air. 6. Control system and signal failure: A. Various sensor failures, such as: inside temperature sensor, evaporator temperature sensor, outlet temperature sensor, refrigerant pressure sensor, outside temperature sensor, multi-function sensor, sunlight sensor, etc. B, AAC control module itself failure.