ORIFICE TUBE REPLACEMENT
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 condenserto-
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.
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.
A forum community dedicated to all General Motors truck owners and enthusiasts. Come join the discussion about performance, lift kits, wheels, tires, modifications, troubleshooting, maintenance, and more!