Chrysler Concorde 2004 Service Manual page 1552

7 - 6 COOLING
COOLING (Continued)
CONDITION
POOR DRIVEABILITY
(THERMOSTAT POSSIBLY
STUCK OPEN). GAUGE MAY
BE READING LOW.
STEAM IS COMING FROM
FRONT OF VEHICLE NEAR
GRILL AREA WHEN WEATHER
IS WET, ENGINE WARMED UP
AND RUNNING WITH VEHICLE
STATIONARY, OR JUST SHUT
OFF. TEMPERATURE GAUGE
IS NORMAL.
COOLANT COLOR
COOLANT LEVEL CHANGES
IN COOLANT BOTTLE.
TEMPERATURE GAUGE IS IN
NORMAL RANGE.
DIAGNOSIS AND TESTING - COOLING SYSTEM
LEAK
With engine not running, wipe the coolant bottle
neck sealing seat clean.
Attach a radiator pressure tester to the coolant
bottle, as shown in (Fig. 2) and apply 104 kPa (15
psi) pressure. If the pressure drops more than 2 psi
in 2 minutes inspect all points for external leaks.
POSSIBLE CAUSES
3. Radiator fan operating
incorrectly.
4. Has undercoating been applied
to any unnecessary component?
5. Engine may be running rich,
causing the catalytic converter to
overheat
1. For proper driveability, clean
vehicle emissions and prevention of
buildup of engine oil sludge, the
thermostat must be operating
properly. Has a diagnostic trouble
code been set?
1. During wet weather, moisture
(snow, ice, rain, or condensation)
on the radiator will evaporate when
the thermostat opens. The
thermostat opening allows heated
coolant into the radiator. When the
moisture contacts the hot radiator,
steam may be emitted. this usually
occurs in cold weather with no fan
or air flow to blow it away.
1. Coolant color is not necessarily
an indication of adequate corrosion
or temperature protection. Do not
rely on coolant color for determining
condition of coolant.
1. Level changes are to be
expected as coolant volume
fluctuates with engine temperature.
The coolant level will also drop as
the system removes air from a
recent filling.
CORRECTION
3. (Refer to 7 - COOLING/ENGINE/
RADIATOR FAN - DIAGNOSIS AND
TESTING) Repair as necessary.
4. Clean undercoating as necessary.
5. (Refer to Appropriate Diagnostic
Information)
1. (Refer to Appropriate Diagnostic
Information) Replace thermostat if
necessary
1. Occasional steam emitting from this
area is normal. No repair is necessary.
1. Check the freeze point of the
coolant. (Refer to 7 - COOLING/
ENGINE/COOLANT - DIAGNOSIS AND
TESTING) Adjust the ethylene
glycol-to-water ratio as necessary and
service according to maintenance
schedule. (Refer to LUBRICATION &
MAINTENANCE/MAINTENANCE
SCHEDULES - DESCRIPTION)
1. A normal condition. No repair is
necessary.
All hoses, radiator and heater, should be moved
while at 15 psi since some leaks occur while driving
due to engine rock, etc.
If the cooling system will not pressurize easily and
there is no coolant leaks, the cooling system is only
partially filled. (Refer to 7 - COOLING - STANDARD
PROCEDURE - COOLING SYSTEM FILL)
If there are no external leaks after the gauge dial
shows a drop in pressure, detach the tester. Start
engine and run the engine to normal operating tem-
LH