First of all, it may be because of the lack of snow species. Secondly, it may be because the electromagnetic attraction is unstable, which leads to the unstable operation of the compressor. It may also be that the temperature sensor of the evaporation box is out of order, and the air conditioning temperature cannot be adjusted normally. When the polo air conditioner is cold or not, the following steps can be taken to check it. Check whether the evaporator is damaged first. If there is air leakage, you need to replace the evaporator. Secondly, you can check whether there is a problem with N280. First, you can test the voltage to determine whether there is any problem, then thoroughly clean it, and finally put on a new rubber ring for pressure test to see if there is any leakage. If all the above tests are normal, let's see if adding snow seeds can solve the problem. Pay special attention to the amount of snow seeds added here. Too high or too low will affect the normal use of air conditioners. If the above methods can't solve the problem, it is likely that there is something wrong with the air conditioner compressor. The problem of compressor is usually manifested as unstable refrigeration. Only when the engine rotates at high speed can it be cooled normally. This situation must be solved by replacing the compressor.