A. Whether there is too much refrigerant - too much should be reduced
B. Whether there is air in the refrigerant
Reason of stress-free:
High-pressure pressure too low
A. Insufficient refrigerant - insufficient should be added
B. Whether there is any spoils in the system - if there are spoils, clean up or replace all of them.
C. Whether the drying bottle is clogged - clogging to be replaced
D. Whether the expansion valve is faulty - faulty must be replaced
Reason of stress-free:
Excessive low-pressure
A, whether the refrigerant is too much - more to be reduced
B. Whether there is air in the refrigerant system - air to be drained
C. Whether the opening of the expansion valve is too large - the valve should be replaced if the opening is large
D. Whether the compressor is faulty - there are faults to be repaired or replaced
Low low pressure
A. Whether the refrigerant is insufficient - add according to the requirements of the vehicle
B. Whether there is water in the system - water drainage
C. Is there any spoils in the system - clogging to be cleaned or replaced parts
D. Whether the expansion valve is ice clogged - replacement parts
