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HAC-162 < SYMPTOM DIAGNOSIS > [MANUAL AIR CONDITIONER] INSUFFICIENT COOLING Both High- and Low-pressure Sides are Too Low Low-pressure Side Sometimes Becomes Negative Gauge indication Refrigerant cycle Probable cause Corrective action High-pressure side is too low and High and low-pressure sides Compressor pressure opera- Replace compressor. No temperature difference be- Compressor pressure opera- Replace compressor. AC356A 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 desiccant assem- bly. • Check lubricant for contami- nation. • 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 lubricant for contami- nation. Expansion valve and liquid Low refrigerant charge Check refrigerant for leaks. There is a big temperature dif- Expansion valve closes a little Improper expansion 2. Malfunctioning thermal 3. Outlet and inlet may be • Remove foreign particles by using compressed air. • Check lubricant for contami- nation. An area of the low-pressure Low-pressure pipe is clogged • Check and repair malfunc- tioning parts. • Check lubricant for contami- nation. Air flow volume is not enough Evaporator is frozen. • Check thermo control amp. and intake sensor operation. • Replace compressor. AC353A |