Expansion Valve: Service and Repair

Evaporator Expansion Valve Replacement

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

2. Disconnect the suction line and receiver line from the evaporator core.

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

4. Remove the joint duct.

5. Remove the bolts, inlet and outlet pipes (A), and expansion valve (B).





6. 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.