K 3500 Truck 4WD V8-393 6.5L DSL Turbo VIN S (1995)
Expansion Block/Orifice Tube: Service and Repair
Evaporator Tube
Tool Required:
J 26549-E Orifice Tube Remover and Installer or Equivalent
Remove or Disconnect
1. Discharge and recover refrigerant from the system.
2. Grille.
3. Evaporator tube (41) from condenser (32).
4. O-ring seal (42).
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Cap or plug the open line.
5. Expansion (orifice) tube from the condenser outlet pipe, using J 26549-E or equivalent.
In the event that 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 drier, epoxy drier or equivalent) approximately 7 mm (1/4 inch) from dimples on outlet pipe. Do
not overheat pipe.
CAUTION: 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 switch.
C. While applying heat, use 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 tube into condenser outlet pipe, using J 26549-E or equivalent.
2. New O-ring seal (42).
A. Coat O-ring seal with 525 viscosity refrigerant oil.
B. Insert the short screen end of the new orifice into the evaporator tube.
3. Evaporator tube (41) to condenser (32).
4. Grille.
5. Refrigerant to the system.
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Check the system for leaks.