The pressure at the high pressure side is
higher than the specified value or is too
high; the pressure at the low pressure
side is too high; the air conditioner is
under refrigeration; the compressor
makes exceptional sounds (especially
when just starts the engine).
The refrigerant in the refrigerant
pipelines is excessive
The expansion valve fails or the
compressor is disabled
Evacuate the refrigerant
●If the volume of the refrigerant is normal
1. Replace the expansion valve
2. Refill the refrigerant to the system
3. Test the pressure again
●If the refrigerant is obviously excessive
1. Refill the refrigerant to the system
2. Test the pressure again.
Note: If the system is still off normal after
retesting the pressure, install the expansion
valve, have it replaced and dredge the
pipelines with compressed air and nitrogen,
and then further replace the compressor and
the fluid reservoir and drying chamber.
When turning off the engine, the pressure
at the high pressure side slightly rises
while the pressure at the low pressure
side slightly falls; the air conditioner is
under refrigeration.
The compressor is disabled Dredge the pipelines with compressed air
and nitrogen
Replace the compressor and the fluid
reservoir and drying chamber
High pressure side is correct, low
pressure side is too low, AC refrigerating
correct, sometimes the evaporator has ice
(even the refrigerant quantity is correct)
The expansion valve fails or the
compressor is disabled
Replace the expansion valve
Refill the refrigerant to the system
Test the pressure again
Note: If the system is still off normal after
retesting the pressure, install the expansion
valve, have it replaced and dredge the
pipelines with compressed air and nitrogen,
and then further replace the compressor and
the fluid reservoir and drying chamber.
1. High/low pressure sides are correct,
AC refrigerating deficiency.
2. High/low pressure sides are correct,
compressor is abnormal (especially when
the engine is started), AC refrigerating
good
The transmission oil in the air
conditioner pipelines is excessive
Evacuate the refrigerant
●Dredge the pipelines with compressed air
and nitrogen
Note: Adjust the volume of the lubricant
when replacing such component of the air
conditioner system as the compressor
The reservoir can not be used
• Puncture
• The sealed part is damaged
• Thread of fasten part is damaged,
outside air entering to system
Replace
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