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General Motors: Installation

  1. Install liquid line "O" rings. Lubricate inside of evaporator inlet line and "O" rings with refrigerant oil. Lubricate orifice tube and "O" ring with refrigerant oil. Insert orifice tube into evaporator inlet line, with short screen toward condenser.
  2. Tighten liquid line nut to 18 ft. lbs. (24 N.m). To complete installation, reverse removal procedure. Evacuate, charge, and test system for proper operation.


  1. Clean evaporator line fitting with refrigerant oil. Coat inside of inlet line and evaporator line "O" rings with refrigerant oil. Lubricate orifice tube and "O" ring with refrigerant oil, and insert "O" rings into inlet line. Insert orifice tube into evaporator inlet line, with long screen inlet end toward condenser.
  2. Tighten bolt to 12 ft. lbs. (16 N.m). Tighten evaporator line fitting to 28 ft. lbs. (38 N.m). To complete installation, reverse removal procedure. Evacuate, charge, and test system for proper operation.


  1. Coat inside of condenser inlet line and "O" rings with refrigerant oil. Lubricate orifice tube "O" ring with refrigerant oil, and insert into condenser inlet line. Insert orifice tube into condenser inlet line, with shorter screen toward evaporator.
  2. Connect condenser-to-evaporator line clip on right side body rail. Lubricate "O" rings and connect condenser inlet line. On "J" body, tighten condenser inlet line nut to 12 ft. lbs. (16 N.m). On "N" body, tighten condenser inlet line bolt to 18 ft. lbs. (24 N.m). On all models, install closeout panel. Evacuate, charge, and test system for proper operation.


  1. Coat inside of inlet line and "O" ring with refrigerant oil. Lubricate orifice tube and "O" ring with refrigerant oil, and insert "O" rings into inlet line. Insert orifice tube into evaporator inlet line, with short screen toward condenser.
  2. Tighten liquid line fitting at orifice tube to 20 ft. lbs. (27 N.m). To complete installation, reverse removal procedure. Evacuate, charge, and test system for proper operation.


  1. Clean liquid line fitting with refrigerant oil. Coat inside of liquid line and "O" ring with refrigerant oil. Lubricate orifice tube and "O" ring with refrigerant oil, and insert "O" rings into liquid line. Insert longer orifice tube screen (inlet end) into condenser outlet line first, toward condenser.
  2. Tighten liquid line fitting to 18 ft. lbs. (24 N.m). To complete installation, reverse removal procedure. Evacuate, charge, and test system for proper operation.


  1. Clean liquid line fitting with refrigerant oil. Add one ounce of refrigerant oil to system. Coat inside of liquid line and "O" rings with refrigerant oil. Lubricate orifice tube and "O" ring with refrigerant oil, and insert "O" rings into liquid line. Insert shorter orifice tube screen into liquid line first, with long screen (inlet end) toward condenser.
  2. Tighten liquid line fitting to 20 ft. lbs. (27 N.m). To complete installation, reverse removal procedure. Evacuate, charge, and test system for proper operation.


  1. Clean liquid line fitting with refrigerant oil. Add one ounce of refrigerant oil to system. Coat inside of liquid line and "O" rings with refrigerant oil. Lubricate orifice tube and "O" ring with refrigerant oil, and insert "O" rings into liquid line. Insert orifice tube into liquid line, with long screen (inlet end) toward condenser.
  2. Tighten liquid line fitting to 20 ft. lbs. (27 N.m). To complete installation, reverse removal procedure. Evacuate, charge, and test system for proper operation.
ORIFICE TUBE LOCATION & REMOVER/INSTALLER APPLICATION (GENERAL MOTORS)

Application Orifice Tube Location Orifice Tube Remover/Installer
Cars
"C" Body (1) (2)
"E" & "K" Body (1) J-26549-D
"F" Body Evaporator Inlet (2)
"G" Body Evaporator Inlet J-26549-E
"H" Body Condenser Outlet J-26549-D
"J" & "N" Body Condenser Outlet (3)
"W" Body (4) J-26549-E
Trucks & Vans
"C" & "K" Series
With Rear A/C Evaporator Inlet J-26549-E
Without Rear A/C Condenser Outlet J-26549-E
"G" Series Evaporator Inlet J-26549-E
"L" & "M" Series Evaporator Inlet J-26549-E
"S" & "T" Series Evaporator Inlet J-26549-D
"U" Series Condenser Outlet (2)
(1) In evaporator (liquid) inlet line, between service valves, above accumulator.
(2) Grip orifice tube using orifice tube needle-nose pliers. Use a turning motion along with a push-pull motion to loosen and remove orifice tube.
(3) When replacing orifice tube, compare original orifice tube design with replacement component to ensure correct selection.
(4) In evaporator (liquid) inlet line, between high-side service valve and evaporator.
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