Why does the holding pressure of car air conditioning increase?
1 Answers
The specific reasons for the increase in pressure gauge readings during car air conditioning maintenance are as follows: 1. Air in the system, which requires complete evacuation and recharging of refrigerant. 2. System blockage, mostly due to expansion valve blockage or malfunction, with the solution being replacement of the expansion valve. 3. Excessive refrigerant, requiring complete evacuation and precise recharging of refrigerant. 4. Poor heat dissipation in the condenser, solved by cleaning the condenser and radiator grille of debris, and replacement if necessary. 5. Expansion valve failure, indicated by excessive dew or frost on the low-pressure pipe, with the solution being checking the correct installation of the expansion valve and replacement if incorrect. 6. Other faults, such as cooling fan failure, engine overheating, excessive or insufficient refrigeration oil.