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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 910 (Heating, Ventilation And Air Conditioning) >> Repair Instructions >> Expansion (Orifice) Tube Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Recover the refrigerant from the system. Refer to REFRIGERANT RECOVERY AND RECHARGING .
  2. Remove the evaporator tube from the evaporator (1). Refer to EVAPORATOR TUBE REPLACEMENT (2.2L)  or EVAPORATOR TUBE REPLACEMENT (4.3L) .
  3. Remove the O-ring seal and discard.
  4. Use the J 26549-E  in order to remove the expansion (orifice) tube (2).
  5. If you have difficulty removing a restricted or plugged expansion (orifice) tube, use the following procedure:
    1. 5.1 Remove as much of any impacted residue as possible.
      Fig 1: Removing Evaporator Tube From Evaporator
      G01466905Courtesy of GENERAL MOTORS CORP.
      NOTE: 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.

      Important:  DO NOT overheat the pipe.

    2. 5.2 Carefully apply heat with a heat gun (hair dryer, epoxy dryer, or equivalent) approximately 7 mm (0.25 in) from the dimples on the inlet pipe.
    3. 5.3 While applying heat, use the J 26549-E  or equivalent in order to grip the expansion (orifice) tube.
    4. 5.4 Use a turning motion along with a push-pull motion in order to loosen the impacted expansion (orifice) tube.

      Remove the expansion (orifice) tube.

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