Dodge R1500 1999 Service Manual page 151

2) Disconnect liquid line/suction line bracket. Disconnect
liquid line at orifice tube. Remove orifice tube using specified
orifice tube remover/installer. See ORIFICE TUBE LOCATION &
REMOVER/INSTALLER APPLICATION table.
3) If difficulty is encountered during removal of a plugged
or restricted orifice tube, remove as much residue as possible. Using
a heat gun, carefully heat inlet line. If inlet line has small
dimples, apply heat 1/4" from dimples. Be careful not to overheat
line.
4) 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.
Installation
1) Coat inside of inlet line and "O" ring with refrigerant
oil. Lubricate orifice tube and "O" ring with refrigerant oil and
insert them 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.
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, 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 refrigerant oil. Coat
inside of liquid line and "O" ring with refrigerant oil. Lubricate
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, carefully apply heat 1/4" from dimples on liquid line. Be
careful not to overheat line.