Expansion Block/Orifice Tube: Service and Repair

Tool Required:
J 26549-E Orifice Tube Remover and Installer or Equivalent

Remove or Disconnect
1. Discharge and recover refrigerant from the system.
2. Evaporator tube from the evaporator.
3. O-ring seal.
4. Expansion (orifice) tube using J 26549-E.
- If difficulty is encountered during the removal of a restricted or plugged expansion (orifice) tube, the following procedure is recommended:
A. Remove as much of any impacted residue as possible.
B. Carefully apply heat with heat gun (hair dryer, epoxy dryer, or equivalent) approximately 7 mm(0.25 inch) from dimples on the inlet pipe. Do not overheat the pipe.

NOTICE: If the system has a pressure switch near the expansion tube location, it should be removed prior to heating the pipe to avoid damage to the switch.

C. While applying heat, use the expansion tube removal tools (J 26549-E) or equivalent to grip the expansion (orifice) tube. Use a turning motion along with a push-pull motion to loosen the impacted expansion (orifice) tube and remove it.

Install or Connect

1. Expansion (orifice) tube using J 26549-E.

Important
- Install the shorter screen end first into the evaporator.

2. New O-ring seal.
- Coat O-ring seal with 525 viscosity refrigerant oil.
3. Evaporator tube to the evaporator.

Tighten
- Tube to 27.5 N.m (20 lb ft).

4. Refrigerant to the system.
- Check the system for leaks.