Expansion Valve: Service and Repair

Thermal Expansion Valve Replacement


REMOVAL PROCEDURE

TOOLS REQUIRED
J39183-C R-134a Manifold Gauge Set




1. Remove the evaporator from the vehicle.
2. Remove the expansion valve (3) from the evaporator.




3. Connect the expansion valve (3) to a J 39183-C. Connect the gauge set charging hose to a Refrigerant-134a refrigerant drum (2).
4. Soak the valve's remote bulb in water.
5. Close both the high pressure valve and the low pressure valve.
6. Open the valve to the refrigerant drum.
7. Open the high pressure valve to approximately 5 kg/cm.sq (70 psi).
8. Read the pressure indicated on the low pressure gauge (5).
9. Measure the water temperature with a thermometer.




10. The pressure/temperature relationship should fall within the specifications shown in the table. If the pressure/temperature does not fall into the specifications, replace the expansion valve.

INSTALLATION PROCEDURE




1. Install the expansion valve (3) to the evaporator.
2. Install the evaporator case to the vehicle.