Lumina V6-3.8L VIN K (1998)
Expansion Block/Orifice Tube: Service and Repair
Refrigerant Lines To Compressor
Remove or Disconnect
1. Air cleaner and duct assembly.
2. Recover refrigerant.
3. ABS modulator electrical connector.
4. Electrical connector to A/C pressure sensor/fan switch.
5. Liquid line/suction line bracket.
6. Liquid line fitting at orifice.
7. Expansion (Orifice) Tube.
Important
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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 residues as possible.
B. Carefully apply heat with heat gun (hair drier, epoxy drier or equivalent) approximately 1/4 inch from dimples on inlet pipe. Do not
overheat pipe.
NOTICE: 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.
C. While applying heat, use needle-nose pliers to grip the orifice tube. Use a turning motion along with a push-pull motion to loosen the
impacted orifice tube and remove it.
D. Add 30 ml (1 ounce) of mineral base 525 viscosity refrigerant oil to system.
E. Lubricate new orifice tube and O-ring with mineral base 525 viscosity refrigerant oil and insert into inlet pipe. Install in proper direction
(smaller screen first).
8. O-rings.
Install or Connect