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TROUBLE DIAGNOSES FOR ABNORMAL PRESSURE =NMHA0084 Whenever the system’s high and/or low side pressure is abnormal, diagnose using a manifold gauge. The Both High and Low-pressure Sides are Too High. NMHA0084S01 Gauge indication Refrigerant cycle Probable cause Corrective action Both high and low-pressure sides AC359A I Pressure is reduced soon Excessive refrigerant charge Reduce refrigerant until speci- Air suction by cooling fan is Insufficient condenser cooling " 1. Condenser fins are clogged. 2. Improper fan rotation of cooling fan I Clean condenser. I Check and repair cooling I Low-pressure pipe is not I When compressor is 2 , 28 psi). It then decreases gradually there- Poor heat exchange in con- " Air in refrigeration cycle Evacuate repeatedly and Engine tends to overheat. Engine cooling systems mal- Check and repair each I An area of the low-pres- I Plates are sometimes cov- I Excessive liquid refrigerant I Excessive refrigerant dis- I Expansion valve is open a " 1. Improper thermal valve installation 2. Improper expansion valve adjustment Replace expansion valve. GI MA EM LC EC FE CL MT AT PD AX SU BR ST RS BT SC EL IDX TROUBLE DIAGNOSES Insufficient Cooling (Cont’d) HA-47 |