cause of issue
    After the air conditioning is turned on, the main reason for the lack of air-conditioning system is: the refrigerant is insufficient; the system is dirty; the condenser fan does not turn; the air circulation around the condenser is poor; the cooling is bad; the air duct of the evaporator is blocked by dust and debris; Compressor electromagnetic clutch slippage; compressor damage, internal leakage; outside the throttle is not closed, the car outside the hot air into the car.
    Check and exclude
    In case of this failure, should first use the manifold pressure gauge to check the system pressure, if the high pressure below 0.883Mpa, low pressure below 0.078Mpa, at the same time, from the glass window found in the bubble, the outlet is not cold, indicating that the refrigerant Or a serious leak, should be checked and supplement the refrigerant. After maintenance, the engine to 2000r / min speed operation, until the bubble disappears, with manifold pressure gauge check, low side pressure should be 0.118Mpa ~ 0.216Mpa, high pressure side pressure should be 1.274Mpa ~ 1.596Mpa.
    Then, check the system is dirty. System dirty block, refers to the compressor generated in the operation of mechanical impurities and refrigerant on the wall of the system off the impurities, the storage tank drying tank or expansion valve blocked, so that the refrigerant flow blocked. In this regard, the manifold pressure gauge can be used to check, if the low side of the vacuum, high pressure side of the pressure is very low, at the same time, storage tank or expansion valve before and after the pipeline hanging frost or ice, the outlet is not cold, and Shut down after the boot did not change much, that is the system dirty block. The treatment is to replace the stock solution or use alcohol to clean the expansion valve.
    Condenser fan does not turn, mostly due to lack of sliding bearings, bearing burnout or motor winding circuit, short circuit caused. After inspection, if the bearing is short of oil, can be sliding in the rear of the motor bearing oil at the top of the drill hole drill a small hole, add a few drops of oil to the oil tank 30 oil lubrication; if the sliding bearing burned, Under the provisions of the requirements, facelift new bearings; if the motor winding circuit or short circuit failure, the motor should be further troubleshooting, or facelift new fan.