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1A–38 HEATING, VENTILATION AND AIR CONDITIONING (HVAC) Condition Correction Possible cause Suction (Low Gauge) Pressure Expansion valve clogged. Replace the expansion valve. Suction (Low Gauge) Pressure Receiver/Drier clogged. Replace the receiver/drier. Suction (Low Gauge) Pressure Expansion valve temperature sensor Replace the expansion valve. Suction (Low Gauge) Pressure Clogged or blocked refrigerant line. Replace refrigerant line. Suction (Low Gauge) Pressure Thermo switch defective. Replace thermo switch. Suction (Low Gauge) and Discharge Excessive refrigerant in system. Discharge and recover the Insufficient cooling. Condenser clogged or dirty. Clean the condenser fin. Suction (Low Gauge) and Discharge Air in system. Evacuate and charge refrigerant. Suction (Low Gauge) and Discharge Insufficient refrigerant in system. Check for leaks. Discharge and A/C — Air Conditioning |