Whether in winter or in hot weather, vehicle air conditioners are often used, especially in cold winter, the interior of the car can be adjusted to a comfortable temperature by turning on the warm air. Today, let's talk about cars without heating. What's the problem? Let me briefly talk about the principle of air-conditioning warm air, which is different from air-conditioning refrigeration. Warm air is completed by the heat of the engine antifreeze, that is, the antifreeze circulated by 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, there may be many electronic and mechanical components, such as air outlet sensor, evaporation box temperature sensor, flow valve, circulation valve, water temperature sensor, regulating device and so on. If there is no warm air in the car, let's make sure whether the air outlet of the air conditioner below is out of the air, out of the air conditioning or not. 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 baffle is stuck. Another is that there is wind at the outlet, but it is not hot air.
If the warm air is not hot, it is not necessarily complicated to judge: let's first see if 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, you can focus on whether the thermostat has been in a large cycle state, or whether the signal of the water temperature sensor is true, just repair or replace the original fault. Second, we should focus on whether there is a large temperature difference between the inlet and outlet pipes in front of the warm air box. If this happens, the heater box must be blocked and needs to be disassembled, disassembled or replaced. Thirdly, it depends on whether the flow rate and temperature of antifreeze in the warm air tank meet the requirements. The temperature can be measured by infrared thermometer, and the flow state can be judged comprehensively by storing the diagnostic data and fault problems of the tester. Often encountered are pump loss and damage, warm air flow valve and antifreeze circulation valve damage. Fourth, it depends on whether there is air resistance in the antifreeze system. It is often encountered that the antifreeze has not been used up after replacement. The special cylinder gasket is damaged. The standard anti-freezing exhaust method can be used for further determination.