Expansion Block/Orifice Tube: Service and Repair
EXPANSION (ORIFICE) TUBE REPLACEMENTTOOLS REQUIRED
- J 26549-E Orifice Tube Remover
- J 39400-A Halogen Leak Detector
REMOVAL PROCEDURE
1. Remove the air cleaner.
2. Recover the refrigerant from the system.
3. Remove the evaporator tube from the evaporator.
4. Remove the O-ring seal.
5. Use the J 26549-E in order to remove the orifice tube.
6. If you have difficulty removing a restricted or plugged expansion (orifice) tube, use the following procedure:
6.1. Remove as much of any impacted residue as possible.
6.2. Carefully apply heat with a heat gun (hair dryer, epoxy dryer, or equivalent) approximately 7 mm (0.25 in) from the dimples on the inlet pipe. DO NOT overheat the pipe.
NOTE: If the system has a pressure switch near the expansion (orifice) tube location, it should be removed prior to heating the pipe to avoid damage to switch.
6.3. While applying heat, use the J 26549-E in order to remove the orifice tube.
6.4. Use a turning motion along with a push-pull motion in order to loosen the impacted expansion (orifice) tube.
6.5. Remove the expansion (orifice) tube.
INSTALLATION PROCEDURE
1. Use the J 26549-E in order to install the expansion (orifice) tube.
IMPORTANT: Install the shorter screen end of the expansion (orifice) tube into the evaporator first.
2. Install the new O-ring seal.
3. Install the evaporator tube to the evaporator.
NOTE: Refer to Fastener Notice in Service Precautions.
Tighten
Tighten the evaporator tube nut to 28 N.m (20 lb ft).
4. Evacuate and recharge the system.
5. Leak test the fittings of the component using the J 39400-A.
6. Install the air cleaner.