Six kinds of DIY automotive air conditioning specific fault diagnosis

Fault one: hand feel air conditioning high and low temperature pipe fits normal, but the car does not feel cold. DIY Diagnosis: air conditioning is not a simple problem the problem may be in the air conditioning temperature control system. Check the control cable heating switch is off check the heating valve is in the closed position. Before and after the touch valve , under normal circumstances should be " close to the engine side of the high temperature, low temperature, close to the vehicle body side " , as the normal contrast , adjust the heating switch to the off state, such as can’t ?be effectively cooled off replace the heating of water into the switch.

Fault two: Adjust the temperature knob feel the temperature does not change. DIY Diagnosis: wind deflector may be temperature controlled pull off, if shedding need reinstall adjustment; if you feel the outlet of the air volume is not big enough, indicating that the evaporator clogged, you need to disassemble the evaporator for cleaning.

Fault three: Touch air conditioning pipe, pressure pipe hot, low pressure pipe nor cold. DIY Diagnosis: This may be the compressor to frequent on-off phenomenon, especially in the case of high engine speed compressor does not pull, this time can’t avoid prolonged high speed engine, otherwise it will be very dangerous; addition, for the high-pressure pipe overheating, but also check whether there beneath the air conditioning compressor oil, if it proves compressor high pressure limiting valve has been damaged, you need to replace the compressor.

Troubleshooting four: Touch conditioning pipe, pressure pipe is low temperature but low-pressure pipe is high temperature. DIY Diagnosis: such a case the compressor can’t cycle effective to the refrigerant, the compressor may need to be replaced.

 Failure Friday: between the condenser and radiator clogged by dirt, refrigerant overfilled. DIY Diagnosis: first removed dirt, as indeed no dirt clogging , check refrigerant confirm the observation window is too much , if you can see the liquid flow , but do not see any bubbles , then filling the refrigerant excessive, need to re- taking the time to do a standard raise.

Fault six: Start air conditioning and refrigeration system, two electronic fans operate simultaneously, but the air conditioning pump does not pull. DIY Diagnosis: such cases require professional diagnostic circuit system, it is recommended to a professional repair station for repairs.

There many car diagnostic tools can help you test the problem, such as: Autel Maxidiag MD802, MaxiDAS DS708 Tool. If you want know more about car diagnostic information and car diagnostic tool, please click the below site: http://www.autointhebox.com