There are four common "problems" with air conditioners. Here's how to check them

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There are four common "problems" with air conditioners. Here's how to check them [Copy link]

Phenomenon 1: Insufficient cold air output
　　
　　Check:
　　1. Is the air inlet closed?
　　2. Are the condenser coil and heat sink clean?
　　3. Is there enough refrigerant in the system?
　　4. Is the blower motor working properly?
　　5. Is the blower channel blocked?
　　6. Is the air intake filter blocked ?
　　7. Is the evaporator blocked?
　　
　　Judgment:
　　1. If the high pressure gauge shows normal pressure and the low pressure gauge shows high pressure, it means that the evaporator pressure regulator, hot gas bypass valve, and intake throttle valve are faulty or adjusted; 2. If
　　the exhaust air temperature is high, and the pressure gauge indicates normal or high pressure, and the low pressure increases slightly, the expansion valve filter is blocked;
　　3. If the high pressure gauge indicates a pressure exceeding the normal pressure, the low pressure gauge indicates a pressure below the normal pressure, and the receiving dryer and pipeline are frozen, the receiving dryer filter is blocked; 4. If the high pressure gauge indicates a pressure
　　exceeding the normal pressure, there may be too much moisture in the system. If bubbles are found in the observation window, it means that air is mixed in the system.
　　
　　Phenomenon 2: Intermittent cooling
　　
　　Check:
　　1. Check if the circuit switch, fan switch, and fan motor are faulty;
　　2. Check if the compressor coil and solenoid valve are open or poorly grounded, and if the connection is loose;
　　3. Check if the compressor connection device is loose;
　　4. Check if the vacuum pipeline of the instrument control panel;
　　5. Check if the evaporator is blocked.
　　
　　Judgment:
　　1. If the low pressure gauge indicates too high or too low, and the thermostat does not work, the thermostat is faulty;
　　2. If the low pressure gauge and high pressure gauge indicate too low pressure, there is moisture in the system, blocking the hot gas bypass valve or the suction throttle valve.
　　
　　Phenomenon 3: No air conditioning
　　
　　Check:
　　1. Is the compressor drive belt loose or broken?
　　2. Fuse;
　　3. Fuse connecting wire;
　　4. Is the connecting wire disconnected?
　　5. Compressor coupling coil and solenoid valve;
　　6. Is the thermostat electrical contact normal? Is the temperature sensing element faulty?
　　7. Is the fan normal?
　　8. Ignition switch and relay;
　　9. Is the compressor frozen? 10. Is the
　　refrigerant pipeline leaking ?
　　11. Is the compressor oil seal leaking?
　　
　　Judgment:
　　1. If there is hot water in the heater and the evaporator releases hot air, the heater valve does not work.
　　2. When the engine is at any speed, the readings of the high and low pressure gauges only change slightly, then the compressor tongue valve is faulty.
　　
　　Phenomenon 4: The system has noise
　　
　　Check:
　　1. Is the exhaust window blade loose?
　　2. Is the compressor drive belt loose or worn?
　　3. Is the compressor mounting bolt loose?
　　4. Listen carefully to see if there is noise from the compressor?
　　5. Compressor connection and solenoid valve.
　　
　　Judgment:
　　1. The compressor coil and solenoid valve are faulty;
　　2. The compressor liquid level is too low;
　　3. The fan blower is faulty;
　　4. If there is too much moisture in the system, the expansion valve will make noise;
　　5. If the pressure is high, the servo valve will close and the compressor will make knocking noise.