Expansion Valve: Testing and Inspection

ON-VEHICLE INSPECTION
1. CHECK QUANTITY OF GAS DURING REFRIGERATION CYCLE

2. INSTALL MANIFOLD GAUGE SET

3. RUN ENGINE
Run the engine at 1.500 rpm for at least 5 minutes. Then check that the high pressure reading is 1.37 - 1.53 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), otherwise it is OK.

HINT: When the low pressure drops to 0 kPa (0 kgf/sq. cm, 0 psi). feel the receiver's IN and OUT side for zero temperature difference.