TROUBLESHOOTING GUIDE — Case 6 (Expansion valve stuck open) and Case 7 (Faulty compressor)

U-17prose procedure

Case 6: Expansion valve stuck open

Specification	Value
Measured pressure — Low-pressure sideCase 6	Above 245 kPa (2.5 kg/cm², 35.6 psi)kPa / kg/cm² / psi
Measured pressure — High-pressure sideCase 6	1,864—1,962 kPa (19—20 kg/cm², 270—284 psi)kPa / kg/cm² / psi

Measured pressure — Low-pressure sideCase 6

Above 245 kPa (2.5 kg/cm², 35.6 psi)kPa / kg/cm² / psi

Measured pressure — High-pressure sideCase 6

1,864—1,962 kPa (19—20 kg/cm², 270—284 psi)kPa / kg/cm² / psi

Condition: Insufficient cooling

1
Check whether there is frost or heavy dew on the suction pipe (between cooling unit and compressor).
05U0UX-030
2
If neither is found, refer to "Excessive refrigerant or insufficient condenser cooling"; page U-15.
3
If either is found, replace the expansion valve. (Refer to page U-33.)

Specification	Value
Measured pressure — Low-pressure sideCase 7	392—589 kPa (4—6 kg/cm², 57—85 psi)kPa / kg/cm² / psi
Measured pressure — High-pressure sideCase 7	687—981 kPa (7—10 kg/cm², 100—142 psi)kPa / kg/cm² / psi

Measured pressure — Low-pressure sideCase 7

392—589 kPa (4—6 kg/cm², 57—85 psi)kPa / kg/cm² / psi

Measured pressure — High-pressure sideCase 7

687—981 kPa (7—10 kg/cm², 100—142 psi)kPa / kg/cm² / psi

Condition: No cooling

1
Run the engine at a first idle.
05U0UX-031
2
Verify that the magnetic clutch is ON when the A/C switch and blower switch are ON.
3
If the magnetic clutch remains OFF, refer to "Magnetic clutch does not operate"; page U-9.