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INSUFFICIENT COOLING HAC-249 < SYMPTOM DIAGNOSIS > [MANUAL A/C (TYPE 2)] C D E F G H J K L M A B HAC N O P 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 High-pressure Side is Too Low and Low-pressure Side is Too High 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 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 Gauge indication Refrigerant cycle Probable cause Corrective action High-pressure side is too high and Upper side of condenser and High-pressure tube or parts lo- • Check and repair or replace malfunctioning parts. • Check oil for contamination. AC360A |