In the process of using the car, I believe that many friends have encountered that there is no cold wind blowing out after opening the AC, so what is the cause, and how do we solve such a fault? Let's take a look at it together.
Causes and solutions for air conditioners not to cool
First, the refrigeration system lacks refrigerant, which is what we often call Freon R-134a, the refrigeration process of air conditioning is actually the process of R-134a continuous circulation, if it is missing, there is naturally no cold air. In the inspection, it can be solved by refilling the refrigerant table, but it should be noted that before filling, it is necessary to check whether the refrigerant system has leaks, and if there is, it is necessary to repair the leakage point before filling.
Second, the compressor does not work, it includes the compressor itself damage and compressor line problems, if the compressor end harness power supply, grounding, signal is no problem, is the compressor damage, replace the new parts can be solved; if the compressor end does not have a power supply, you need to check the insurance, relay and wiring harness, and then targeted repair can be.
Third, the air conditioning pressure sensor is inaccurate, this sensor is used to detect the refrigerant pressure in the air conditioning pipeline, if it is damaged, it will falsely report that the pressure is too high or too low, and then make the compressor enter the protection mode without working, the solution is to replace the air conditioning pressure sensor.
Fourth, the outdoor temperature sensor is damaged, if the outdoor temperature sensor is disconnected, it will transmit the wrong information, such as the actual outdoor temperature is about 15 ° C, but it reports a signal of -40 ° C, resulting in the compressor can not work, because the compressor generally stops working when the outdoor temperature is lower than 5 degrees Celsius. The solution is to replace the outdoor temperature sensor. In addition, the same is true for the indoor temperature sensor, if damaged, it will also cause the compressor not to work.
Fifth, the engine temperature is too high, when the vehicle water temperature is too high, the compressor will enter the protection mode, so as to stop working to prevent the occurrence of burning out of the compressor, the solution is to eliminate the fault of high water temperature.
Sixth, the blower resistance is damaged, if the vehicle starts and opens the AC and air volume, but the air outlet does not have a little wind blowing out, it is the blower resistance damage, you can first measure the power supply and ground on the blower, if not is caused by the fuse burning, replace the fuse can be; if there is, you need to replace the new blower or resistance.
Seventh, the surface of the condenser is dirty, when the condenser is covered with insects, dust, willow, muddy water and other debris, it will affect the heat dissipation efficiency of the air conditioning system, which in turn will lead to a decrease in the cooling effect in the car. When solving, you can use the water gun to clean the car, but it should be noted that the pressure of the water gun should be lowered to avoid high pressure and damage to the condenser.
Eighth, the AC air conditioning control panel is damaged, when the internal circuit board of the module appears solder joint desoldering, triode damage, it will lead to the refrigeration request signal can not be sent, the air conditioning can not work properly, the solution is to repair or replace the air conditioning panel.
The above are the eight most common reasons why the car air conditioner has no cold air, namely no refrigerant, the compressor does not work, the air conditioning pressure sensor is inaccurate, the outdoor temperature sensor is inaccurate, the water temperature is too high, the blower is damaged, the condenser is dirty and the control panel is damaged, hoping to help you and reduce the troubles of daily use of the car.