HVAC System - General Servicing: Removal & Installation GMC Envoy I

Removal ("C" & "K" Series)

1. Discharge A/C system, using approved recovery/recycling equipment. On models equipped with front A/C system only, remove front grille. Using a backup wrench, loosen condenser-to-evaporator (liquid) line fitting at condenser and disconnect line.
2. On models equipped with rear A/C system, loosen condenser-to-evaporator (liquid) line fitting between junction block and evaporator. If necessary, remove air cleaner assembly.
3. On all models, remove and discard fitting "O" ring. Using Orifice Tube Remover/Installer (J-26549-E), remove orifice tube from liquid line. If difficulty is encountered during removal of a plugged or restricted orifice tube, remove as much residue as possible.
4. Using a heat gun or hair dryer, carefully apply heat 1/4" from dimples on liquid line. Be careful not to overheat line. If A/C pressure switch is located near orifice tube, remove switch to protect it from heat.
5. While heat is being applied, grip orifice tube using orifice tube remover/installer. Use a turning motion along with a push-pull motion to loosen and remove orifice tube.

Installation

1. Clean liquid line fitting with NEW refrigerant oil. Coat inside of liquid line and NEW "O" ring with NEW refrigerant oil. Lubricate NEW orifice tube and "O" ring with refrigerant oil and insert them 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.

Removal ("G", "L" & "M" Series)

1. Discharge A/C system, using approved recovery/recycling equipment. Using a backup wrench, loosen evaporator inlet (liquid) line fitting at evaporator. Disconnect inlet line. Remove and discard "O" ring(s). Using Orifice Tube Remover/Installer (J-26549-E), remove orifice tube from liquid line.
2. If difficulty is encountered during removal of a plugged or restricted orifice tube, remove as much residue as possible. Using a heat gun or hair dryer, carefully apply heat 1/4" from dimples on liquid line. Be careful not to overheat line.
3. If A/C pressure switch is located near orifice tube, remove switch to protect it from heat. While heat is being applied, grip orifice tube using orifice tube remover/installer. Use a turning motion along with a push-pull motion to loosen and remove orifice tube.

1. Clean liquid line fitting with NEW refrigerant oil. Add one ounce of NEW refrigerant oil to system. Coat inside of liquid line and NEW "O" rings with NEW refrigerant oil. Lubricate NEW orifice tube and "O" ring with refrigerant oil and insert them 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.

Removal ("U" Series)

1. Remove air cleaner and duct assembly. Discharge A/C system, using approved recovery/recycling equipment. Using a backup wrench, loosen condenser outlet (liquid) line fitting at orifice tube. Disconnect liquid line. Remove and discard "O" rings. Using needle-nose pliers, remove orifice tube from liquid line.
2. If difficulty is encountered during removal of a plugged or restricted orifice tube, remove as much residue as possible. Using a heat gun or hair dryer, carefully apply heat 1/4" from dimples on liquid line. Be careful not to overheat line.
3. If A/C pressure switch is located near orifice tube, remove switch to protect it from heat. While heat is being applied, grip orifice tube using needle-nose pliers. Use a turning motion along with a push-pull motion to loosen and remove orifice tube.

1. Clean liquid line fitting with NEW refrigerant oil. Add one ounce of NEW refrigerant oil to system. Coat inside of liquid line and NEW "O" rings with NEW refrigerant oil. Lubricate NEW orifice tube and "O" ring with refrigerant oil and insert them 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