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(4) Evacuate, charge, and test system. Refer to operating instructions of your refrigerant recovery/recycling
/charging station for proper procedures.
Expansion valve stuck open
Measured pressure
Low-pressure : Above 35.6 psi (2445 kPa, 2.50 kg/cm²)
High-pressure : Below 88 psi (608 kPa, 6.20 kg/cm²)
- Condition - Insufficient cooling
1. Check whether there is frost or heavy dew on suction pipe (between cooling unit compressor).
2. If neither is found, refer to "Excessive Refrigerant or Insufficient Condenser Cooling".
3. If either is found, replace expansion valve.
Faulty compressor
Measured pressure
Low-pressure : 57~88 psi (392~608 kPa, 4.0~6.20 kg/cm²)
High-pressure : 107~152 psi (736~1,050 kPa, 7.50~10.7 kg/cm²)
- Condition - No cooling
1. Run engine at a fast idle.
2. Verify that A/C compressor clutch is ON when A/C switch and blower switch are ON.
3. If A/C compressor clutch remains OFF, refer to "A/C Compressor Clutch does not Operate.
Manifold gauge set
Fittings for attaching manifold gauge set are on the high-and low-pressure pipes.
1. Close both hand valves of manifold gauge set.
2. Connect the low-pressure hose to high-pressure gauge fitting.
3. Tighten hose nuts by hand only.
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