GM Caprice 1990-1993 Repair Guide

Orifice Tube

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REMOVAL & INSTALLATION



See Figure 1



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Fig. Fig. 1: Orifice/Expansion tube

  1. Properly discharge the air conditioning system.
  2.  
  3. Loosen the fitting at the liquid line on evaporator inlet pipe and disconnect. Discard the O-ring and cap the line opening.
  4.  

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

  1. Carefully, remove the fixed orifice tube from the tube fitting in the evaporator inlet line using tool J-26549E or a pair of needle nose pliers.
  2.  
  3. In the event that the restricted or plugged orifice tube is difficult to remove, perform the following:
    1. Remove as much of the impacted residue as possible.
    2.  
    3. Using a hair dryer, epoxy drier or equivalent, carefully apply heat approximately 1 / 4 inch from the dimples on the inlet pipe. Do not overheat the pipe.
    4.  

  4.  

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

    1. While applying heat, use special tool J-26549-E or equivalent to grip the orifice tube. Use a turning motion along with a push-pull motion to loosen the impacted orifice tube and remove it.
    2.  


  1. Swab the inside of the evaporator inlet pipe with R-11 to remove any remaining residue.
  2.  
  3. Add 1 oz. of 525 viscosity refrigerant oil to the system.
  4.  
  5. Lubricate the 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.
  2.  

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

  1. Evacuate, recharge and leak test the system.
  2.  

 
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