Expansion Valve: Testing and Inspection

ON-VEHICLE INSPECTION OF EXPANSION VALVE
1. CHECK QUANTITY OF REFRIGERANT GAS DURING REFRIGERATION CYCLE
2. INSTALL MANIFOLD GAUGE SET
3. RUN ENGINE
Run the engine at 2,000 rpm for at least 5 minutes.
4. CHECK EXPANSION VALVE
If the expansion valve is clogged, the low pressure reading will drop to 0 kg /cm2 (0 psi, 0 kPa), otherwise it is OK.