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 - 1.57 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 sides for zero temperature difference.