Four common inspection and judgment for automotive air-conditioning system

Phenomenon: lack of air-conditioning outputAn examination:

1, the air intake is closed;

2, condenser coils and fins are clean;

3. refrigerant system adequacy;

4, if the blower motor is working properly;

5, the blower channel is blocked;

6, the intake filter is blocked;

7, the evaporator is blocked. 

judge:1, if the high pressure gauge showed normal pressure, high pressure and low pressure table shows described evaporator pressure regulator, hot gas bypass valve, an intake throttle valve failure or transfer;2, if the discharge air temperature is high, and the pressure gauge indicates normal, or high and low pressure slightly increased, the expansion valve filter blocked;3. If the high pressure gauge indicates more than the normal pressure, low pressure gauge indicates below normal service, while receiving a dryer and piping icing, the receiver drier filter blockage;4. If the high pressure gauge indicates more than the normal pressure, the system may have excessive moisture. If there are air bubbles in the observation window, indicating that the system air is mixed

Phenomenon II: air conditioning offAn examination:

1. open magnetic circuit, fan switch, fan motor is faulty;

2, the compressor coils and solenoid valve is open or poor grounding and connection is loose;

3, the compressor is loose coupling device;

4, dashboards vacuum line;

5, the evaporator is blocked.

Judge:1, if the low pressure gauge indicates too high or too low, adjust the thermostat and does not work, then the thermostat failure;2, if the low tables and high pressure gauge indicates the pressure is too low, there is moisture in the system, clogging the intake throttle valve or hot gas bypass.

Three phenomena: no air conditioningAn examination:

1, the compressor drive belt is loose or broken;

2, Fuse;

3, the fuse connecting wire;

4, connecting wire is disconnected;

5, the compressor and the solenoid valve coupling coil;

6, thermostats electrical contact is normal, the temperature sensing element is faulty;

7, fans;

8, ignition switches and relays;

9, the compressor is frozen;

10, the refrigerant piping for leaks;

11, compressor seal leaks.

Judge:1, if there is hot water heater, evaporator heat release, the heater valve is not working.2, when the engine is in any speed, with only minor changes table high and low readings, the tongue compressor valve failures.

Phenomenon IV: System noiseAn examination:

1, vent window blade is loose;

2, the compressor drive belt is loose, wear;

3, the compressor mounting bolt is loose;

4, listen carefully whether there is noise compressor;

5, the compressor wiring and solenoid valves.

Judge:1, the compressor coil and solenoid valve failure;2, the compressor level is too low;3, fan fan failure;4, if too much moisture in the system, the expansion valve noise;5, if the high pressure is servo valve is closed, the compressor generates noise percussion.

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