Chrysler Stratus Convertible. Manual — part 217
RADIATOR FAN CONTROL
The radiator has a single cooling fan, with a two
speed motor (Fig. 13). The fan is controlled by the
Powertrain Control Module (PCM) which energizes
the fan relay. Fan operation is accomplished three
ways:
• When air conditioning system pressure reaches
210 psi, fan will operate.
• Coolant temperature reaches 215° F, fan will
operate.
• Models equipped with automatic transmission, a
fluid thermister may have some influences on fan
operation.
• Refer to tables below for fan operation.
ELECTRIC FAN MOTOR TEST
Refer to Powertrain Diagnostic Manual for proce-
dure.
For wiring diagrams of the fan motor systems refer
to Group, 8W Wiring Diagrams.
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 -59°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
70% by volume glycol).
A refractometer 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 only
recommended for limited usage. Refer to appropriate
Technical Service Bulletin(s) regarding use of propy-
lene glycol based coolants.
CAUTION: Do not mix types of coolant—corrosion
protection will be severely reduced.
Because ethylene glycol and propylene glycol do
not have the same specific gravities, the use of a
hydrometer will be inaccurate. Therefore, Special
Tool 8286 refractometer, is recommended when test-
ing either ethylene or propylene glycol coolants.
RADIATOR FAN OPERATION—2.5L ENGINE
Radiator Fan Control
A/C Pressure
A/C Off
Low
High
Fan On:
102°C
(215°F)
107°C
(224°F)
Fan Off:
96°C
(205°F)
103°C
(217°F)
A/C On
Low
High
Low
High
Fan On:
102°C
(215°F)
107°C
(224°F)
1,448
Kpa
(210
psi)
1,718
Kpa
(249 psi)
Fan Off:
96°C
(205°F)
101°C
(213°F)
1,207
Kpa
(175
psi)
1,585
Kpa
(229 psi)
EATX Fluid Temperature
Low
Speed
High
Speed
Fan On:
118°C
(244°F)
122°C
(252°F)
Fan Off:
116°C
(240°F)
118°C
(244°F)
Fig. 13 Cooling Fan
1 – TRANSMISSION OIL COOLER
2 – SINGLE FAN
3 – FAN MODULE FASTENERS
4 – DRAINCOCK
JX
COOLING SYSTEM
7 - 15
DIAGNOSIS AND TESTING (Continued)
COOLING SYSTEM LEAK TESTING
With engine not running, wipe the coolant filler
neck sealing seat clean. The radiator should be full.
Attach a radiator pressure tester to the coolant
filler neck, as shown in (Fig. 14) and apply 104 kPa
(15 psi) pressure. If the pressure drops more than 2
psi in 2 minutes inspect all points for external leaks.
All hoses, radiator and heater, should be moved
while at 104 kPa (15 psi) since some leaks occur
while driving due to engine rock, etc.
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-
perature in order to open the thermostat and allow
the coolant to expand. Reattach the tester. If the nee-
dle on the dial fluctuates, it indicates a combustion
leak and is usually a head gasket leak.
WARNING: WITH
TOOL
IN
PLACE
PRESSURE
BUILDS UP FAST. ANY EXCESSIVE AMOUNT OF
PRESSURE BUILT UP BY CONTINUOUS ENGINE
OPERATION MUST BE RELEASED TO A SAFE
PRESSURE POINT. NEVER PERMIT PRESSURE TO
EXCEED 138 kPa (20 psi).
If the needle on the dial does not fluctuate, race
the engine a few times. If an abnormal amount of
coolant or steam is emitted from the tailpipe, it may
indicate a faulty head gasket, cracked engine block or
cylinder head.
There may be internal leaks which can be deter-
mined by removing the oil dipstick. If water globules
appear intermixed with the oil, it will indicate a
internal leak in the engine. If there is an internal
leak, the engine must be disassembled for repair.
COOLING SYSTEM PRESSURE RELIEF CHECK
The pressure cap upper gasket to filler neck seal
can be checked by removing the overflow hose at the
radiator filler neck overflow nipple (Fig. 15). Attach
the radiator pressure tester to the filler neck over-
flow nipple, and pump air into the system. The
pressure cap upper gasket should relieve pressure at
69-124 kPa (10-18 psi), and hold pressure at 55 kPa
(8 psi) minimum.
WARNING: THE WARNING WORDS “DO NOT OPEN
HOT” ON THE PRESSURE CAP IS A SAFETY PRE-
CAUTION. WHEN HOT, THE COOLING SYSTEM
BUILDS UP PRESSURE. TO PREVENT SCALDING
OR OTHER INJURY, THE PRESSURE CAP SHOULD
NOT BE REMOVED WHILE THE SYSTEM IS HOT
AND/OR UNDER PRESSURE.
There is no need to remove the pressure cap at any
time except for the following purposes:
• Check and adjust coolant freeze point
• Refill system with new coolant
• Conducting service procedures
• Checking for leaks
WARNING: IF VEHICLE HAS BEEN RUN RECENTLY,
WAIT
15
MINUTES
BEFORE
REMOVING
CAP.
PLACE A SHOP TOWEL OVER THE CAP, AND WITH-
OUT
PUSHING
DOWN,
ROTATE
IT
COUNTER-
CLOCKWISE TO THE FIRST STOP. ALLOW FLUIDS
TO ESCAPE THROUGH THE OVERFLOW TUBE.
WHEN THE SYSTEM STOPS PUSHING COOLANT
AND STEAM INTO THE CRS TANK AND PRESSURE
DROPS, PUSH DOWN ON THE CAP AND REMOVE
IT
COMPLETELY.
SQUEEZING
THE
RADIATOR
INLET HOSE WITH A SHOP TOWEL (TO CHECK
PRESSURE) BEFORE AND AFTER TURNING TO
THE FIRST STOP IS RECOMMENDED.
Fig. 14 Pressure Testing Cooling System—Typical
Fig. 15 Cooling System Pressure Cap to Filler Neck
1 – OVERFLOW NIPPLE
2 – MAIN SPRING
3 – GASKET RETAINER
4 – STAINLESS-STEEL SWIVEL TOP
5 – RUBBER SEALS
6 – VENT VALVE
7 – THERMOSTAT HOUSING/ENGINE OUTLET CONNECTOR
8 – FILLER NECK
7 - 16
COOLING SYSTEM
JX
DIAGNOSIS AND TESTING (Continued)
COOLING SYSTEM PRESSURE CAP TESTING
Dip the pressure cap in water; clean off any depos-
its on the vent valve or its seat, and apply the cap to
end of radiator pressure tester (Fig. 16). Working the
plunger, increase the pressure to 104 kPa (15 psi) on
the gauge. If the pressure cap fails to hold pressure
of at least 97 kPa (14 psi), replace the cap.
CAUTION: The radiator pressure tester is very sen-
sitive to small air leaks that will not cause cooling
system problems. A pressure cap that does not
have a history of coolant loss should not be
replaced just because it leaks slowly when tested
with this tool. Add water to the tool. Turn the tool
upside down, and recheck the pressure cap to con-
firm that the cap is faulty.
If the pressure cap tests properly while posi-
tioned the on radiator pressure tester, but will not
hold pressure or vacuum when positioned on the
filler neck, inspect the filler neck and cap top gas-
ket for irregularities that may prevent the cap from
sealing properly.
LOW COOLANT LEVEL AERATION
Low coolant level in a cross flow radiator will
equalize in both tanks with engine off. With engine
at running operating temperature the high pressure
inlet tank runs full and the low pressure outlet tank
drops. If this level drops below the top of the trans-
mission oil cooler, air will be sucked into the water
pump:
• Transmission oil will become hotter.
• High reading shown on the temperature gauge.
• Air in the coolant will also cause loss of flow
through the heater.
• Exhaust gas leaks into the coolant can also
cause the same problems.
COOLING SYSTEM DEAERATION
Air can only be removed from the system by gath-
ering under the pressure cap. On the next heat up it
will be pushed past the pressure cap into the coolant
recovery container by thermal expansion of the cool-
ant. It then escapes to the atmosphere in the coolant
recovery container and is replaced with coolant on
cool down.
ACCESSORY DRIVE BELT
Satisfactory performance of the belt driven accesso-
ries depends on belt condition and proper belt ten-
sion.
Fig. 16 Pressure Testing Radiator Cap
1 – PRESSURE CAP
2 – PRESSURE TESTER
JX
COOLING SYSTEM
7 - 17
DIAGNOSIS AND TESTING (Continued)
ACCESSORY DRIVE BELT DIAGNOSIS
CONDITION
POSSIBLE CAUSE
CORRECTION
INSUFFICIENT ACCESSORY
OUTPUT DUE TO BELT SLIPPAGE
1. Belt too loose.
1. Adjust belt tension.
2. Belt excessively glazed or worn.
2. Replace and tighten as specified.
BELT SQUEAL WHEN
ACCELERATING ENGINE
1. Belts too loose.
1. Adjust belt tension.
2. Belts glazed.
2. Replace belts.
BELT CHIRP AT IDLE
1. Belts too loose.
1. Adjust belt tension.
2. Foreign material imbedded in
belt.
2. Replace belt.
3. Non-uniform belt.
3. Replace belt.
4. Misaligned pulley(s).
4. Align accessories.
5. Non-uniform groove or eccentric
pulley.
5. Replace pulley(s).
BELT ROLLED OVER IN GROOVE
OR BELT JUMPS OFF
1. Broken cord in belt.
1. Replace belt.
2. Belt too loose, or too tight.
2. Adjust belt tension.
3. Misaligned pulleys.
3. Align accessories.
4. Non-uniform grooves or eccentric
pulley.
4. Replace pulley(s).
ENGINE BLOCK HEATER
If unit does not operate, trouble can be in either
the power cord or the heater element. Test power
cord for continuity with a 110-volt voltmeter or 110-
volt test light; test heater element continuity with an
ohmmeter or 12-volt test light.
SERVICE PROCEDURES
COOLANT LEVEL CHECK—ROUTINE
Do not remove radiator cap for routine cool-
ant level inspections.
The coolant reserve system provides a quick visual
method for determining the coolant level without
removing the radiator cap. With the engine cold
and not running, simply observe the level of the
coolant in the reserve tank. The level should be
between the minimum and maximum marks.
COOLANT—ADDING ADDITIONAL
NOTE: The radiator cap should not be removed.
When additional coolant is needed, it should be
added to the coolant recovery/reserve container (Fig.
17). Use only 50/50 concentration of ethylene glycol
type antifreeze and water.
COOLANT LEVEL SERVICING—2.5L ENGINE
NOTE: The cooling system is closed and designed
to maintain coolant level to the top of the radiator.
When servicing requires a coolant level check in
the radiator, the engine must be off and not under
pressure. Drain several ounces of coolant from the
radiator drain cock while observing the Coolant
Recovery Container. Coolant level in the container
should drop slightly. Then remove the radiator cap
(Fig. 17). The radiator should be full to the top. If
not, and the coolant level in the recovery container is
at the ADD mark there is a air leak in the recovery
system. Check hose or hose connections to the recov-
ery container, radiator filler neck or the pressure cap
seal to the radiator filler neck for leaks.
COOLING SYSTEM—DRAINING
NOTE: Drain, flush, and fill the cooling system at
the mileage or time intervals specified in the Group
0, Lubrication and Maintenance. If the solution is
dirty, rusty or contains a considerable amount of
sediment, clean and flush with a reliable cooling
system cleaner. Care should be taken in disposing
of the used engine coolant. Check governmental
regulations for disposal of used engine coolant.
7 - 18
COOLING SYSTEM
JX
DIAGNOSIS AND TESTING (Continued)
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