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HA-14 < SYMPTOM DIAGNOSIS > REFRIGERATION SYSTEM SYMPTOMS LOW-PRESSURE SIDE BECOMES NEGATIVE LOW-PRESSURE SIDE BECOMES NEGATIVE : Symptom Table INFOID:0000000000959847 Gauge indication Refrigerant cycle Probable cause Corrective action Low-pressure side sometimes be- • Air conditioning system does not function and does not cy- • The system constantly func- tions for a certain period of Refrigerant does not discharge ↓ Moisture is frozen at expan- ↓ Water is mixed with refrigerant. • Drain water from refrigerant or replace refrigerant. • Replace liquid tank. AC354A Gauge indication Refrigerant cycle Probable cause Corrective action Low-pressure side becomes nega- Liquid tank or front/rear side of High-pressure side is closed ↓ Expansion valve or liquid tank Leave the system at rest until cooling is okay. Then the wa- • If due to foreign particles, re- move expansion valve and • If either of the above meth- ods cannot correct the mal- • Replace liquid tank. nation. AC362A |