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HA-22 < SYMPTOM DIAGNOSIS > REFRIGERATION SYSTEM SYMPTOMS WITH MONOCHROME DISPLAY INFOID:0000000009465930 Whenever system ′s high and/or low side pressure is abnormal, diagnose using a manifold gauge. The marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the stan- dard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air temperature- to-operating pressure table). Both High- and Low-pressure Sides are Too High High-pressure Side is Too High and Low-pressure Side is Too Low Magnet clutch does not engage. Go to Trouble Diagnosis Procedure for Magnet Clutch. Insufficient cooling Go to Trouble Diagnosis Procedure for Insufficient Cooling. No cool air comes out. Insufficient heating Go to Trouble Diagnosis Procedure for Insufficient Heating. No warm air comes out. Noise Go to Trouble Diagnosis Procedure for Noise. Memory function does not operate. Go to Trouble Diagnosis Procedure for Memory Function. Symptom Reference Gauge indication Refrigerant cycle Probable cause Corrective action Both high- and low-pressure sides Pressure is reduced soon af- Excessive refrigerant charge in Reduce refrigerant until speci- Air suction by cooling fan is in- Insufficient condenser cooling Condenser fins are 2. Improper fan rotation of • Clean condenser. if necessary. • Low-pressure pipe is not cold. • When A/C compressor is stopped high-pressure val- 2 , 28 psi). It then decreases Poor heat exchange in con- Evacuate and recharge system. Engine tends to overheat. Engine cooling systems mal- Check and repair engine cool- • An area of the low-pressure pipe is colder than areas • Plates are sometimes cov- ered with frost. • Excessive liquid refrigerant on low-pressure side • Excessive refrigerant dis- charge flow • Expansion valve is open a lit- tle compared with the speci- ↓ Replace expansion valve. AC359A |