Chrysler 300M 2002 Service Manual page 198

LH
ENGINE (Continued)
glycol and distilled water (Refer to LUBRICATION &
MAINTENANCE/FLUID TYPES - DESCRIPTION).
INSPECTION
After performing
inspect all hoses, clamps and connections for deterio-
ration and leaks. Inspect radiator and heater core for
leaks.
COOLANT
DIAGNOSIS AND TESTING - COOLANT
CONCENTRATION TESTING
Coolant concentration should be checked when any
additional coolant was added to system or after a
coolant drain, flush and refill. The coolant mixture
offers optimum engine cooling and protection against
corrosion when mixed to a freeze point of -37°C
(-34°F) to -46°C (-50°F). The use of a hydrometer or a
refractometer can be used to test coolant concentra-
tion.
A hydrometer will test the amount of glycol in a
mixture by measuring the specific gravity of the mix-
ture. The higher the concentration of ethylene glycol,
the larger the number of balls that will float, and
higher the freeze protection (up to a maximum of
60% by volume glycol).
A refractometer (Special Tool 8286)(Refer to 7 -
COOLING - SPECIAL TOOLS) will test the amount
of glycol in a coolant mixture by measuring the
amount a beam of light bends as it passes through
the fluid.
Some coolant manufactures use other types of gly-
cols into their coolant formulations. Propylene glycol
is the most common new coolant. However, propylene
glycol based coolants do not provide the same freez-
ing protection and corrosion protection and is not rec-
ommended.
CAUTION: Do not mix types of coolant—corrosion
protection will be severely reduced.
COOLANT OUTLET
CONNECTOR - 2.7L
REMOVAL
WARNING: DO NOT REMOVE PRESSURE CAP
WITH THE SYSTEM HOT AND UNDER PRESSURE
BECAUSE SERIOUS BURNS FROM COOLANT CAN
OCCUR.
a cleaning/flush procedure,
(1) Drain cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
(2) Remove upper intake manifold (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE
REMOVAL).
(3) Remove screws attaching heater tube to outlet
connector.
(4) Disengage tube from outlet connector only
enough for connector removal.
(5) Remove bolts attaching water outlet connector
(Fig. 1).
(6) Remove outlet connector.
Fig. 1 Coolant Outlet Connector - 2.7L
1 - BOLT (2)
2 - BOLT (2)
3 - COOLANT OUTLET CONNECTOR
INSTALLATION
(1) Clean sealing surfaces. Inspect gaskets for
tears and cuts. Replace as necessary.
(2) Install outlet connector and tighten bolts to 12
N·m (105 in. lbs.) (Fig. 1).
(3) Inspect and replace heater supply tube O-ring
as necessary.
(4) Lubricate O-ring and insert heater tube assem-
bly into outlet connector. Tighten screws to 3 N·m (30
in. lbs.).
(5) Install upper intake manifold (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE
INSTALLATION).
(6) Fill cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
ENGINE 7 - 19
MANIFOLD -
MANIFOLD -