Expansion Valve: Testing and Inspection

EXPANSION VALVE ON-VEHICLE INSPECTION

1. CHECK QUANTITY GAS DURING REFRIGERATION CYCLE

2. INSTALL MANIFOLD GAUGE SET

3. RUN ENGINE

Run the engine at 2,000 rpm for at least 5 minutes.
Then check that the high pressure reading is 1.275 - 1,471 kPa (13 - 15 kgf/cm2, 185 - 213 psi).

4. CHECK EXPANSION VALVE

If the expansion valve is faulty, the low pressure reading will drop to 0 kPa (0 kgf/cm2, 0 psi), otherwise it is OK.

HINT: When the low pressure drops to 0 kPa (0 kgf/ cm2, 0 psi), feel the receiver's IN and OUT side for no temperature difference.