Expansion Valve: Testing and Inspection

ON-VEHICLE INSPECTION

1. CHECK QUANTITY OF GAS DURING REFRIGERATION CYCLE

2. SET ON MANIFOLD GAUGE SET

3. RUN ENGINE
a. Run the engine at 1 ,500 rpm for at least 5 minutes.
b. Then check that the high pressure reading is 1.37 - 1.57 MPa (14 - 16 kgf/sq.cm, 199 - 228 psi).

4. CHECK EXPANSION VALVE
If the expansion valve is faulty, the low pressure reading will drop to 0 kPa (0 kgf/sq.cm, 0 psi).

HINT: When the low pressure drops to 0 kPa (0 kgf/sq.cm, 0 psi), check the receiver's IN and OUT sides for no temperature difference.