Expansion Valve: Testing and Inspection

ON-VEHICLE INSPECTION
1. Check quantity of refrigerant gas during refrigeration cycle.
2. Install manifold gauge set.
3. Run the engine at 2,000 rpm at least 5 minutes.
4. Read the manifold gauge and check the gas leakage from the evaporator by using gas leak detector.
1. If the expansion valve is clogged low pressure, reading will drop to 0 kg/sq.cm, otherwise it is okay.
2. If the expansion valve is clogged or gas leak from the evaporator, then repair or replace as necessary.