Expansion Valve: Service and Repair

THERMAL EXPANSION VALVE REPLACEMENT

TOOLS REQUIRED
J 39400-A Halogen Leak Detector

REMOVAL PROCEDURE
1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging.




2. Remove the evaporator outlet hose nut from the TXV.

IMPORTANT: When removing the TXV, keep dirt and foreign material from getting on or into the O-ring sealing surfaces. Clean tools and a clean work area are important for proper service. The TXV seal area should be cleaned before any repairs are performed. The parts must be kept clean at all times and any parts to be assembled should be cleaned with a non-petroleum based solvent and dried with air. Use only lint free cloths to wipe parts. Do not allow solvent to enter evaporator or hoses.

3. Remove the evaporator outlet hose from the TXV.
4. Install a protective cap to the evaporator outlet hose to prevent contamination and desiccant saturation.




5. Remove the liquid line nut from the TXV.
6. Remove the liquid line from the TXV.
7. Install a protective cap to the liquid line to prevent contamination and desiccant saturation.




8. Disconnect the refrigerant low temperature sensor from the engine harness.




9. Remove the TXV bolts from the backing plate.
10. Remove the TXV and the backing plate from the vehicle.
11. Remove and discard the O-rings from the evaporator pipes.
12. Install a protective cap to the evaporator pipes to prevent contamination and desiccant saturation.

INSTALLATION PROCEDURE




1. Remove the protective caps from the evaporator pipe and ensure the seal areas are clean, dry and lint free.

IMPORTANT: Use only lint free cloths to wipe parts. Do not allow any solvent to enter evaporator or hoses.

2. Install new O-rings to the evaporator pipes.
3. Remove the protective caps from the TXV.
4. Install the TXV and the backing plate to the evaporator pipes.

NOTE: Refer to Fastener Notice in Service Precautions.

5. Install the TXV bolts to the backing plate.

Tighten the bolts to 9 N.m (80 lb in).




6. Remove the protective cap from the liquid line.
7. Install a new seal washer to the liquid line.
8. Install the liquid line to the TXV.
9. Install the liquid line nut to the TXV.

Tighten the nut to 16 N.m (12 lb ft).




10. Remove the protective cap from the evaporator outlet hose.
11. Install a new seal washer to the evaporator outlet hose.
12. Install the evaporator outlet hose to the TXV.
13. Install the evaporator outlet hose nut to the TXV.

Tighten the nut to 16 N.m (12 lb ft).




14. Connect the refrigerant low temperature sensor to the engine harness.
15. Evacuate and charge the A/C system. Refer to Refrigerant Recovery and Recharging.
16. Test the affected A/C joints for leaks using J 39400-A.