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INSUFFICIENT COOLING HAC-89 < SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONER] C D E F G H J K L M A B HAC N O P Both High- and Low-pressure Sides are Too Low Low-pressure Side Sometimes Becomes Negative Low-pressure Side Becomes Negative Gauge indication Refrigerant cycle Probable cause Corrective action Both high- and low-pressure sides • There is a big temperature difference between liquid • Liquid tank inlet and expan- sion valve are frosted. Liquid tank inside is slightly • Replace liquid tank. • Temperature of expansion valve inlet is extremely low • Expansion valve inlet may be frosted. • Temperature difference oc- curs somewhere in high- High-pressure pipe located be- • Check and repair malfunc- tioning parts. • Check oil for contamination. Expansion valve and liquid Low refrigerant charge. Check refrigerant system for HA-26, "Checking of Refriger- There is a big temperature dif- Expansion valve closes a little Improper expansion 2. Malfunctioning expansion 3. Outlet and inlet may be • Remove foreign particles by using compressed air. • Check oil for contamination. An area of the low-pressure Low-pressure pipe is clogged • Check and repair malfunc- tioning parts. • Check oil for contamination. Air flow volume is too low. Evaporator is frozen. • Check intake sensor circuit. Refer to . • Repair evaporator fins. Blower Motor Component AC353A 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 • Drain water from refrigerant or replace refrigerant. • Replace liquid tank. AC354A |