Expansion Valve: Testing and Inspection

EXPANSION VALVE 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/cm2, 199 - 228 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 zero temperature difference.