Expansion Block/Orifice Tube: Service and Repair
EXPANSION (ORIFICE) TUBE REPLACEMENTTOOLS REQUIRED
^ J 26549-E Orifice Tube Remover and Installer
^ J 39400-A Halogen Leak Detector
REMOVAL PROCEDURE
1. Recover the refrigerant from the A/C system. Refer to Refrigerant Recovery and Recharging.
2. Remove the bolt (1) from the evaporator case.
3. Remove the evaporator tube from the evaporator.
4. Use the J 26549-E in order to remove the expansion (orifice) tube (1).
5. Remove the restricted or plugged expansion tube:
^ Remove as much of the impacted residue as possible.
^ Carefully apply heat with a heat gun, or hair dryer 7 mm (0.25 in) from the dimples on the inlet pipe.
DO NOT overheat the pipe.
^ While applying heat, use the J 26549-E in order to grip the expansion tube. Use a turning motion along with a push-pull motion to loosen the impacted expansion tube and remove.
INSTALLATION PROCEDURE
IMPORTANT:
^ Install the shorter screen end (3) first into the evaporator.
^ Coat the O-ring seal (2) with 525 viscosity refrigerant oil.
1. Use the J 26549-E in order to install the expansion tube.
NOTE: Refer to Fastener Notice in Service Precautions.
2. Install the evaporator tube to the evaporator.
Tighten
Tighten the evaporator tube to 19 N.m (14 lb ft).
3. Install the bolt (1) to the evaporator tube to the evaporator cover.
4. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging.
5. Leak test the fittings of the components using the J 39400-A.