Expansion Valve: Service and Repair

THERMAL EXPANSION VALVE REPLACEMENT

TOOLS REQUIRED
J 39400-A Halogen Leak Detector

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




2. Remove the evaporator outlet hose and liquid line retainer plate nut from the TXV.

IMPORTANT: When removing the thermal expansion valve (TXV), keep dirt and foreign material from getting on or into the 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 and liquid line from the TXV.
4. Remove and discard the sealing washers from the evaporator outlet hose and liquid line.
5. Install protective caps to the evaporator outlet hose and the liquid line to prevent contamination and desiccant saturation.




6. Remove the TXV bolts from the backing plate.
7. Remove the TXV and the backing plate from the vehicle.
8. Remove and discard the seal washers from the evaporator pipes.
9. Install a protective cap to the evaporator pipes to prevent contamination and desiccant saturation.

INSTALLATION PROCEDURE




1. Remove the protective caps from the evaporator pipes 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 seal washers to the evaporator pipes.
3. Remove the protective caps from the TXV.
4. Install the TXV and the backing plate to the evaporator pipes.
5. Install the TXV bolts to the backing plate.

Tighten the bolts to 3.5 N.m (31 lb in).

NOTE: Refer to Fastener Notice.




6. Remove the protective caps from the liquid line and the evaporator outlet hose.
7. Install new seal washers to the liquid line and the evaporator outlet hose.
8. Install the liquid line and the evaporator outlet hose to the TXV.
9. Install the liquid line and evaporator outlet hose retainer plate nut to the TXV.

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

10. Evacuate and charge the A/C system. Refer to Refrigerant Recovery and Recharging.
11. Test the affected A/C joints for leaks using J 39400-A.