Expansion Valve: Service and Repair

Evaporator Front Expansion Valve Replacement

1. Recover the refrigerant with a recovery/recycling/charging station A/C Refrigerant Recovery.

2. Remove the bolt from the A/C line clamp (A).






3. Remove the bolt, then disconnect the A/C lines (A) from the front evaporator core, and remove the O-rings (B). Separate the guide (C) from the front expansion valve.






4. Remove the blower unit Blower Unit Removal/Installation.

5. Disconnect the connector (A) from the front power transistor, and detach the harness clips (B).






6. Remove the self-tapping screws, the expansion valve cover (A), and the seal (B).






7. Remove the bolts, then remove the inlet/outlet lines (A) and the O-rings (B).





8. Remove the guide (C) and discard it.

9. Remove the insulator (A) and the bolts, then remove the front expansion valve (B) and the O-rings (C).





10. Install the front expansion valve in the reverse order of removal, and note these items:

- Replace the O-rings with new ones at each fitting, and apply a thin coat of refrigerant oil before installing them. Be sure to use the correct O-rings for HFC-134a (R-134a) to avoid leakage.
- Immediately after using the oil, reinstall the cap on the container, and seal it to avoid moisture absorption.
- Do not spill the refrigerant oil on the vehicle; it may damage the paint; if the refrigerant oil contacts the paint, wash it off immediately.
- Charge the system A/C System Charging.
- Make sure that there is no air leakage.
- Make sure that there is no refrigerant leakage.