Chrysler 300M 2002 Service Manual page 1678

LH
HEATER CORE (Continued)
(1) Open the hood and disconnect the negative bat-
tery cable remote terminal from the remote battery
post.
(2) Remove the HVAC unit housing from vehicle.
(Refer to 24 - HEATING & AIR CONDITIONING/
DISTRIBUTION/HVAC HOUSING - REMOVAL)
(3) With the HVAC housing out of the vehicle,
remove (2) screws retaining the heater core. Then
pull the heater core out of the HVAC housing.
INSTALLATION
WARNING: REVIEW THE WARNINGS IN THE FRONT
OF THIS SECTION BEFORE PERFORMING THE
FOLLOWING OPERATION. (Refer to 24 - HEATING &
AIR CONDITIONING/PLUMBING - WARNING)
(1) Install the heater core in the HVAC housing.
Tighten the retaining screws to 2.2 N·m (20 in. lbs.).
(2) Install the HVAC housing in the vehicle. (Refer
to 24 - HEATING & AIR CONDITIONING/DISTRI-
BUTION/HVAC HOUSING - INSTALLATION)
(3) Connect the negative battery cable remote ter-
minal to the remote battery post.
RECEIVER / DRIER
DESCRIPTION
The receiver/drier is located in the engine compart-
ment near the dash panel on the passenger side of
the vehicle. The receiver/drier incorporates a sight
glass for visual diagnosis of the refrigerant system.
OPERATION
High-pressure liquid refrigerant from the con-
denser flows into the receiver/drier. A drying agent,
called a desiccant, is used to remove any traces of
moisture from the refrigerant system. The receiver/
drier also performs a filtering action to prevent for-
eign material in the refrigerant from contaminating
the expansion valve. In addition, during periods of
high demand air conditioner operation, the receiver/
drier acts as a reservoir to store surplus refrigerant.
The A/C refrigerant must be removed from the sys-
tem before removing the receiver/drier using a refrig-
erant recovery machine. Replace the receiver/drier if
an A/C system is left open for an extended period of
time.
The receiver/drier cannot be repaired and, if faulty,
must be replaced.
REMOVAL
WARNING: REVIEW THE WARNINGS IN THE FRONT
OF THIS SECTION BEFORE PERFORMING THE
FOLLOWING OPERATION. (Refer to 24 - HEATING &
AIR CONDITIONING/PLUMBING - WARNING)
(1) Recover the refrigerant from the system. (Refer
to 24 - HEATING & AIR CONDITIONING/PLUMB-
ING - STANDARD PROCEDURE -REFRIGERANT
RECOVERY)
(2) Remove the engine air inlet tube and the air
distribution duct on vehicles equipped with 3.2/3.5
liter engine(Refer to 9 - ENGINE/AIR INTAKE SYS-
TEM/AIR CLEANER ELEMENT - REMOVAL).
(3) Remove one 8mm hex bolt to the receiver/drier
bracket.
(4) Remove the nut retaining the a/c lines to the
expansion valve.
(5) Gently pry the receiver/drier bracket out of the
strut tower.
(6) Remove one a/c line at the receiver/drier (from
the condenser).
(7) Remove the receiver/drier from vehicle.
(8) Remove the small line from the receiver/drier
to the expansion valve to install on the new receiver/
drier.
NOTE: Always install new O-rings when replacing
filter/drier.
(9) Plug or cap liquid line fittings while system is
open to prevent moisture intrusion.
INSTALLATION
WARNING: REVIEW THE WARNINGS IN THE FRONT
OF THIS SECTION BEFORE PERFORMING THE
FOLLOWING OPERATION. (Refer to 24 - HEATING &
AIR CONDITIONING/PLUMBING - WARNING)
Any kinks or sharp bends in the refrigerant plumb-
ing will reduce the capacity of the entire air condi-
tioning system. Kinks and sharp bends reduce the
flow of refrigerant in the system. A good rule for the
flexible hose refrigerant lines is to keep the radius of
all bends at least ten times the diameter of the hose.
In addition, the flexible hose refrigerant lines should
be routed so they are at least 80 millimeters (3
inches) from the exhaust manifold.
High pressures are produced in the refrigerant sys-
tem when the air conditioning compressor is operat-
ing. Extreme care must be exercised to make sure
that each of the refrigerant system connections is
pressure-tight and leak free. It is a good practice to
inspect all flexible hose refrigerant lines at least once
a year to make sure they are in good condition and
properly routed.
NOTE: Upon installation, loosely fit all parts and
lines together before individually tightening them to
prevent damage.
PLUMBING 24 - 41