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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1175 (Heating, Ventilation And Air Conditioning) >> Repair Instructions >> Expansion (Orifice) Tube Replacement >> Removal Procedure

Removal Procedure

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  1. Recover the refrigerant from the A/C system. Refer to REFRIGERANT RECOVERY AND RECHARGING  .
  2. Remove the front evaporator tube to rear evaporator tube retaining bolt.

    Important:  Cap or tape the open A/C Components immediately to prevent system contamination.

  3. Disconnect the front evaporator tube from the rear evaporator tube.
  4. Remove and discard the O-ring.
  5. Cap or tape the rear evaporator tube.
    Fig 1: Disconnecting Front Evaporator Tube From Rear Evaporator Tube
    G01418580Courtesy of GENERAL MOTORS CORP.
  6. Using J 26549-E  remove the orifice tube.
    Fig 2: Removing Orifice Tube
    G01418581Courtesy of GENERAL MOTORS CORP.
  7. Inspect the expansion (orifice) tube for the following conditions and clean or replace with a new tube as indicated:
    • Broken plastic frame; replace the tube
    • Filter screen (1, 2) torn, damaged or plugged with fine gritty material; replace the tube
    • Brass orifice tube (3) damaged or plugged; replace the tube
    • Filter screen (1) coated with metal chips, flakes or slivers; coating may be removed with low pressure shop air and reused if cleaned satisfactorily

      If reusing the orifice tube, install a new O-ring (4)

    Fig 3: Locating Orifice Tube Components
    G01418582Courtesy of GENERAL MOTORS CORP.
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