Expansion Valve: Service and Repair

Thermal Expansion Valve Replacement

Tools Required

J 39400-A Halogen Leak Detector

Removal Procedure

1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging (Non HP2) (Refrigerant Recovery and Recharging (Non HP2)) .
2. Remove the nut from the TXV mounting stud.




3. Remove the evaporator tube and the compressor suction hose from the TXV.
4. Remove and discard the seal washers.




5. Remove the TXV bolts.
6. Remove the TXV.
7. Remove and discard the seal washers.

Installation Procedure




1. Install new seal washers to the evaporator core fittings. Refer to Sealing Washer Replacement (Sealing Washer Replacement) .
2. Install the TXV.

Notice: Refer to Fastener Notice.

3. Install the TXV bolts.

Tighten the bolts to 7 N.m (62 lb in).




4. Install new sealing washers on the evaporator tube and the compressor suction hose fittings. Refer to Sealing Washer Replacement (Sealing Washer Replacement) .
5. Install the evaporator tube and the compressor suction hose to the TXV.
6. Install the TXV nut.

Tighten the nut to 20 N.m (15 lb ft).

7. Evacuate and charge the refrigerant system. Refer to Refrigerant Recovery and Recharging (Non HP2) (Refrigerant Recovery and Recharging (Non HP2)) .
8. Leak test the fittings using the J 39400-A.