Expansion Valve: Service and Repair

Evaporator 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 blower unit Blower Unit Removal/Installation.

4. Remove the bolt, then disconnect the A/C line (A) from the evaporator core and remove the O-rings (B).






5. Disconnect the connectors (A) from the evaporator temperature sensor and the blower resistor, then remove the connector clip (B). Remove the self-tapping screws, the expansion valve cover (C), and the seals (D).






6. Remove the bolts (A), the O-rings (B), the expansion valve (C) and the inlet and outlet lines (D) from the evaporator core (E). Be careful not to bend the lines.






7. Remove the bolts, O-rings (A) and the expansion valve (B) from the inlet and outlet lines (C).





8. Install the 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.
- Make sure that there is no air leakage.
- Charge the system A/C System Charging.