GM Lumina/Grand Prix/Cutlass Supreme/Regal 1988-1996

Expansion (Orifice) Tube

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REMOVAL & INSTALLATION



See Figure 1

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Fig. Fig. 1: Orifice (expansion) tube installation

  1. Have the system properly discharged by a repair shop with an approved recovery/recycling system.
  2.  
  3. If necessary for access to the battery, remove the air cleaner and duct.
  4.  
  5. Disconnect the negative battery cable.
  6.  

Use a backup wrench on the condenser outlet fitting when loosening the lines.

  1. Loosen the fitting at the liquid line-to-evaporator inlet pipe and remove the tube carefully with needle-nose pliers or J 26549-E or equivalent. Discard the line O-rings.
  2.  
  3. If difficulty is encountered during the removal of a restricted or plugged expansion tube, the following procedure may be used:
    1. Remove as much of any impacted residue as possible.
    2.  
    3. Carefully apply heat with a heat gun (hair dryer, epoxy dryer or equivalent) approximately 1 / 4 in. (77mm) away from the dimples on the inlet pipe. Do NOT overheat the pipe.
    4.  
    5. While applying heat, use expansion tube removal tool J 26549-E to grip the expansion tube. Use a turning motion along with a push-pull motion to loosen and remove the expansion tube.
    6.  

  4.  

Different designs and colors of orifice tubes may have been used in past vehicles. When replacing an orifice tube, compare its design to the replacement part for correct orifice selection. Different styles of orifice tubes are NOT interchangeable.

To install:
  1. Swab the inside of the evaporator inlet pipe with a refrigerant system flushing agent to remove any remaining residue.
  2.  
  3. Add 1 oz. of 525 viscosity refrigerant oil to the system.
  4.  
  5. Lubricate a new O-ring and orifice tube with refrigerant oil and insert into the inlet pipe.
  6.  

Ensure that the new orifice tube is inserted in the inlet tube with the smaller screen end first.

  1. Connect the evaporator inlet pipe with the condenser outlet fitting. Tighten the fitting to 20 ft. lbs. (27 Nm).
  2.  

Use a backup wrench on the condenser outlet fitting when tightening the lines.

  1. Using new O-ring seals, assemble evaporator tube/condenser connection hand-tight.
  2.  
  3. Connect the negative battery cable.
  4.  
  5. If removed, install the air cleaner and duct assembly.
  6.  
  7. Have a repair shop evacuate, charge and leak test the A/C system, using the correct equipment.
  8.  

 
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