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TROUBLE DIAGNOSIS ATC-93 C D E F G H I K L M A B ATC High-pressure Side is Too Low and Low-pressure Side is Too High. Both High- and Low-pressure Sides are Too Low. Gauge indication Refrigerant cycle Probable cause Corrective action High-pressure side is too low and High and low-pressure sides Compressor pressure opera- ↓ Damaged inside compressor Replace compressor. No temperature difference Compressor pressure opera- ↓ Damaged inside compressor Replace compressor. AC356A Gauge indication Refrigerant cycle Probable cause Corrective action Both high- and low-pressure sides ● There is a big temperature ● Liquid tank inlet and expan- Liquid tank inside is slightly ● Replace liquid tank. ● Check lubricant for contami- ● Temperature of expansion ● Expansion valve inlet may ● Temperature difference High-pressure pipe located ● Check and repair malfunc- ● Check lubricant for contami- Expansion valve and liquid Low refrigerant charge ↓ Leaking fittings or components Refer to . There is a big temperature dif- Expansion valve closes a little ↓ 1. Improper expansion valve adjustment 2. Malfunctioning thermal valve 3. Outlet and inlet may be clogged. ● Remove foreign particles by ● Check lubricant for contami- An area of the low-pressure Low-pressure pipe is clogged ● Check and repair malfunc- ● Check lubricant for contami- Air flow volume is not enough Evaporator is frozen. ● Check intake sensor circuit. ● Replace compressor. AC353A |