Air conditioning is always cold enough, there was a smell ...... opened the hot weather, more frequent use of car air-conditioning, but headaches for car owners to bring air conditioning but also a lot. Among these issues in addition to care and maintenance, the proper use of air conditioning is also very important. Summer season, the owners enjoy the air conditioning in the car, but also should pay attention to the proper use of car air-conditioning and maintenance methods to improve the life and efficiency of air-conditioning. According to Fong noted fittings, automotive air conditioning system cooling system structure is complex, multi-line connectors, harsh operating environment, it has 80% of the faults in the system. To repair air conditioning performance is:
① completely without air-conditioning supply;
② air conditioning supply shortage;
③ cold air supply is not continuous;
④ air-conditioning system out of control;
⑤ noisy air-conditioning system.
(1) completely cold air supply failure
1) normal and compressor air flow analysis does not rotate with the exclusion
① electromagnetic clutch failure and exclusion
a. fuse is blown, replace it.
b. circuit wiring connector to break or fall off, and check the wiring and connectors connected.
c. relays, switches burn, be replaced.
d. clutch slipping, remove the clutch assembly, repair or replacement.
e. idling stable amplifier is faulty, remove the repair or replacement.
② normal electromagnetic clutch
a. compressor belt breaks or too loose, tighten or replace the belt.
b. compressor failure, the compressor is removed, repaired or replaced.
2) the normal amount of wind, analysis and troubleshooting compressor rotation.
① stuck expansion valve can not be closed (ice blocking or fouling), low pressure gauge reading is too high, the evaporator flow of fluid. Cleaning or replacement of an expansion valve fine mesh.
② refrigerant pipe rupture or leak, high and low pressure gauge reading zero. Replacement of pipes, leak detection system, repair or exchange column reservoir dryer.
③ reservoir on the fusible plug melts, replace soluble plug.
④ compressor inlet and exhaust valves damaged valves or valve plate will replace them.
⑤ reservoir dryer or expansion valve in the fine mesh blocked, hoses or pipes blocked, usually in the limit point frost. Repair or replace the reservoir dryer.
The compressor shaft seal damage. Replace the seals.
Analysis and Troubleshooting no wind 3) Cooler
According to Fong fittings understanding fuse melting off, wiring disconnected or broken; switch or blower motor does not work. Replace the fuse wire; repair switch or blower motor.
(2) lack of air-conditioning supply
Analysis and elimination of a normal) amount of wind
① When the compressor is operating normally
A. high and low pressure are low
a. expansion valve at the barriers, remove obstacles.
b. expansion valve at the opening is too small, adjust or replace.
B. high and low pressure are high
a. high pressure piping barriers, poor flow. Clear obstructions.
b. thermistor failure, replace the thermistor.
c. improper installation of the bulb. Reinstalled.
d. expansion valve at the opening is too large, adjust or replace the expansion valve.
e. excessive amount of oily frozen. Emissions and pumping oil.
f. too much refrigerant, releasing some of the refrigerant.
g. condenser heat is not good. Clean the engine radiator and condenser, install a powerful fan, fan baffles, or re-position gracefully radiator and condenser.
C. high side pressure is too low.
a. pressure line is damaged, replace it.
b. low pressure pipeline blockage, remove obstacles, and to check whether the death bend hoses, replace if necessary.
D. Low side pressure is too low
a. evaporator frosting, adjust the thermostatic switch or pressure controller.
b. expansion valve blockage (blocked or dirty ice block), remove the filter cleaning or replacement.
c. poor low-pressure pipeline, pipeline cleaning up obstacles.
d. thermistor failure, replace the thermistor.
e. Bulb improper installation, re-installation.
E. low pressure is sometimes normal, sometimes negative.
There is moisture in the air-conditioning system, ice blocking phenomenon, this time, the original refrigerant should be emptied and then vacuum, re-charging refrigerant, replace the reservoir dryer.
F. low-stage suction, high-pressure side pressure is low.
The dirt in the air-conditioning system is blocked, clear the system, replace the reservoir dryer.
G. low pressure is too low, the high pressure side pressure
a. storage Drier internal blockage, replace the reservoir dryer.
b. high pressure pipeline blockage, be cleaned or replaced.
H. too low pressure, the high pressure side pressure is low.
a. compressor gasket leaks, replace the gasket.
b. compressor valve is damaged, replace the valve.
② compressor operation is not normal
A. Internal compressor failure. Repair or replacement.
B. compressor belt is too loose, slipping, need to tighten the belt.
C. electromagnetic clutch faulty work
a. compressor clutch slipping. Remove the clutch assembly, repair or replacement.
b. supply voltage is too low, increase the supply voltage.
c. idling stable amplifier is faulty, repair or replacement.
d. line is disconnected, the connection part off, replace the wire connections secure.
e. adverse switch relay, repair or replacement.
f. coil short circuit, following the road, replace it.
g. poorly grounded. Properly grounded.
h. mutual interference between the stator and rotor is adjusted to eliminate the interference.
③ other reasons
Compartment sealed well, hot air through the external windows, doors, etc. flow into the car.
Analysis and exclude normal 2) Airflow
① cold motor normal
a. suction port obstacles be removed.
b. evaporator frost. Clear the evaporator tubes and heat sink.
c. accumulator in filter clogging. Clean or replace the filter.
d. blower tube blockage. Clean or replace the air filter, clear channel obstructions, came along around the live air pipe.
e. blast pipe damage. Replace the air hose.
② cold motor is not normal
. a cold motor switch is not normal; motor is bad; chiller fixed bad. Replace the switch, repair or replace the motor and securely.
. b blown fuse or circuit disconnect; connection section off or poor contact. Replace the fuse wire.
c. chiller external damage or deformation. Be repaired or replaced.
(3) the air is not continuously supplied
Analysis and Troubleshooting normal operation when a) compressor
① air-conditioning system has ice block. Clear system, replace the reservoir dryer.
② thermistor temperature sensing bulb malfunction or be replaced.
③ cooling fan motor damage or motor switch is damaged, replace the damaged parts.
2) analysis and troubleshooting intermittent operation when the compressor
① slipping clutch, remove the clutch assembly, repair or replacement.
② clutch coil is loose or poorly grounded, remove the repair or replacement.
③ switch off the relay when combined, out of control. Replace the control unit.
(4) air-conditioning systems analysis and troubleshooting runaway
1) thermistor temperature sensing bulb malfunction or be replaced.
2) Idle stabilized amplifier is faulty, replace it.
3) expansion valve stuck, remove the repair or replacement.
4) switch solenoid valve control, to be replaced.
(5) a large air-conditioning system noise analysis and excluded.
1) System external noise
① belt too loose or excessive wear. Belt tension or replace belt.
② compressor mounting bracket screws loose. Be tightened.
③ compressor mounting bracket broken, replace the bracket.
④ compressor damage to internal parts. Remove the compressor repair or replacement.
⑤ frozen little oil or no oil. Refuel
⑥ clutch slipping noise. Remove the clutch repaired or replaced.
⑦ clutch bearing starvation or damaged. Lubricating clutch bearings or replace bearings.
⑧ cooling fan motor bearing damage. Replace the cooling fan motor bearings.
⑨ Cooler stent fracture or loosening. If the fracture should be replaced and fixed firmly to check if the loosening and noise, then tighten the bracket.
⑩ cooling fan blade broken or damaged. Replace the cooling fan blades.
? Cooling fan blades and other components of a collision, to find the specific cause, be corrected.
2) the system of internal noise
① excessive refrigerant, work noise, bubbles, high and low pressure gauge reading too observe the inspection window. Discharge excess refrigerant until the pressure gauge reading drops the standard value, and the bubble disappears.
② too little refrigerant expansion valve noise, bubbles and mist, low pressure gauge reading is too low to observe the inspection window. Identify system leak points, clear the system and repair the system and replace the reservoir vacuum dryer, the system refrigerant charge.
③ system is water vapor, causing the expansion valve noise. Removal system, vacuum system, replace the reservoir dryer, add liquid.
④ high pressure side pressure, the high-pressure auxiliary valve is closed, causing the compressor vibration. Now the valve is opened.
Fault 2 general automotive air conditioning heating system analysis and troubleshooting procedures
Like the aforementioned brake system, failure of judgment procedure is based from simple to complex procedures, to determine the exact location of the fault of the driver's warranty after listening to the situation, and troubleshooting. The main faults are:
① no heating or insufficient heating;
② air supply system to stop running;
③ pipeline leaks;
④ heating overheating;
⑤ defrost less hot air;
⑥ heater core smell;
⑦ laborious manipulation or ineffective;
(1) is not heating or inadequate heating analysis and troubleshooting
1) supply system is not normal
① air conditioning blower damaged, to repair replacement.
② blower relays, thermostats damaged, replace it.
③ hot air tube blockage. Clear blockage.
④ temperature vacuum gate drive damage. Replace the vacuum drive.
2) heater system is not normal
① heater leakage.
According to Fong fittings understand, then replace the heater shell.
② air inside the heater core tubes. Air should be discharged.
③ heater ventilation fins caused poor. Should be corrected for the fins, then I can not rule out the replacement.
④ heater surface airflow. Using compressed air to blow through the heater surface.
⑤ plugging the heater core tube fouling. Using chemical methods for core tube descaling.
3) water system is not normal
① poor flow of the cooling water. This system caused by bending pipes should be replaced.
② hot switch or vacuum drive failure. Repair or replacement, in order to ensure there is enough hot water heating.
③ generator thermostat damaged and should be replaced.
④ insufficient coolant, this time should first make up the coolant and radiator cap should be checked for leaks.
(2) supply system analysis and troubleshooting stop running
1) or switch off the fuse melting poor contact. Check the fuse and replace with a fine sandpaper graze switch contacts.
2) blower motor windings burned, replace the coil.
3) the blower speed resistor circuit is damaged, replace the resistor.
Analysis and Troubleshooting (3) pipeline leak
1) hose aging joints strong. Replacement of pipes, fittings securely connected.
2) Hot water switch can not be closed, it should fix the hot water switch.
Analysis (4) Heating overheating and exclusion.
1) improperly adjusted throttle thermostat. Should be re-adjusted.
2) fan speed resistor damaged, replace the resistor.
3) engine thermostat is damaged, replace the thermostat.
(5) lack of hot air defrost analysis and troubleshooting.
1) outlet plug. Should be removed.
2) inadequate heating. To check the appropriate parts: heater, the temperature door, blower, hot water switch, thermostat, as described above (1).
3) Defrost damper improperly adjusted. Re-adjust the throttle.
(6) the smell of the heater core analysis and troubleshooting.
1) Heater inlet pipe joints leak, should be tightened, stuck.
2) heater tube leakage. Replace the heater tubes.
(7) Analysis and Troubleshooting laborious manipulation or uninformed
1) control mechanism stuck throttle stick tight. Should be adjusted or repaired.
2) All the vacuum drive failure, should be replaced.
The above outlines the negative phenomena and air-conditioning systems approach, which can help analyze the reasons, in actual use, so "right", troubleshooting, the air conditioning is working properly.
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