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HAC-304 < SYMPTOM DIAGNOSIS > [AUTO AIR CONDITIONER (W/NAVI)] INSUFFICIENT COOLING Whenever system’s high and/or low side pressure(s) is/are unusual, diagnose using a manifold gauge. The 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 Pressure is reduced soon af- Excessive refrigerant charge in refrig- Reduce refrigerant until Air suction by cooling fan is in- Insufficient condenser cooling perfor- ↓ 1. Condenser fins are clogged. 2. Improper fan rotation of cooling • Clean condenser. fan if necessary. • Low-pressure pipe is not cold. • When compressor is stopped high-pressure val- kg/cm 2 , 28 psi). It then de- creases gradually thereaf- Poor heat exchange in condenser ↓ Air in refrigeration cycle. Evacuate repeatedly and Engine tends to overheat. Engine cooling systems malfunction. Check and repair each en- • 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 discharge flow. • Expansion valve is open a little compared with the specification. ↓ Improper expansion valve adjust- Replace expansion valve. AC359A Gauge indication Refrigerant cycle Probable cause Corrective action High-pressure side is too high Upper side of condenser and High-pressure tube or parts located • Check and repair or re- place malfunctioning • Check oil for contami- nation. AC360A |