Thermal Expansion Valve Replacement

richpin06a Air Conditioning Expansion Valve

Removal Procedure

Important

Verifying the purity of the refrigerant with a refrigerant purity identifier before recovery is recommended.

1. Recover the refrigerant using an approved refrigerant recovery system.

Caution

Observe orientation of the shoulder harness belt to the rear compartment pan as shown in illustration. Incorrect orientation may result in personal injury.

2. Remove the air cleaner cover and the air induction hose at the intake manifold.




3. Remove the suction hose from the TXV.
4. Remove the liquid line from the TXV.




5. Remove the TXV from the evaporator.

Installation Procedure

1. Lubricate with the R-12 Refrigerant mineral oil and install the new O-rings on the evaporator pipes. Remove the protective covers from the TXV.

Notice

Refer to Fastener Notice in Cautions and Notices.

2. Install the TXV on the evaporator and tighten the bolts.
Tighten

Tighten the thermal expansion valve (TXV)-to-evaporator to 10 N·m (89 lb in).

Notice

Use only Polyalkylene Glycol Synthetic Refrigerant Oil (PAG) for internal circulation through the R-134a A/C system and only 525 viscosity mineral oil on fitting threads and O-rings. If lubricants other than those specified are used, compressor failure and/or fitting seizure may result.





3. Lubricate with the R-12 Refrigerant mineral oil and install the new O-rings on the suction hose and liquid line.
4. Install the liquid line to the TXV. Install and tighten the bolt.
Tighten

Tighten the liquid line-to-thermal expansion valve to 25 N·m (19 lb ft).

5. Install the suction hose to the TXV. Install and tighten the bolt.
Tighten

Tighten the suction hose-to-thermal expansion valve to 25 N·m (19 lb ft).





6. Install the air cleaner cover and the air induction hose.
7. Evacuate, charge, and leak test the A/C system.
8. Run the system performance test.