Chrysler Sebring, Stratus sedan, Sebring Convertible. Manual — part 311
OPERATION
CAUTION: Vehicles equipped with 2.0L/2.4L engines
use a different pressure cap than vehicles equipped
with 2.7L engines. The pressure caps are NOT inter-
changeable. Verify proper pressure cap part num-
ber.
The pressure cap allows the cooling system to oper-
ate at higher than atmospheric pressure. The higher
pressure raises the coolant boiling point; this allows
increased radiator cooling capacity.
The gasket in the cap seals the filler neck, so that
vacuum can be maintained, allowing coolant to be
drawn back into the cooling system from the reserve
container.
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - PRESSURE CAP
TESTING
CAUTION: Vehicles equipped with 2.0L/2.4L engines
use a different pressure cap than vehicles equipped
with 2.7L engines. The pressure caps are NOT inter-
changeable. Verify proper pressure cap part num-
ber.
Dip the pressure cap in water. Clean any deposits
off the vent valve or its seat and apply cap to end of
the Pressure Cap Test Adaptor that is included with
the
Cooling
System
Tester
7700.
Working
the
plunger, bring 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 pressure cap.
CAUTION: The Cooling System Tester Tool is very
sensitive to small air leaks that will not cause cool-
ing 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 tool
upside down and recheck pressure cap to confirm
that cap is bad.
If the pressure cap tests properly while positioned
on Cooling System Tester (Fig. 29), but will not hold
pressure or vacuum when positioned on the filler
neck. Inspect the filler neck and cap top gasket for
irregularities that may prevent the cap from sealing
properly.
DIAGNOSIS AND TESTING - COOLING SYSTEM
PRESSURE RELIEF TESTING
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.
CAUTION: Vehicles equipped with 2.0L/2.4L engines
use a different pressure cap than vehicles equipped
with 2.7L engines. The pressure caps are NOT inter-
changeable. Verify proper pressure cap part num-
ber.
The pressure cap upper gasket to filler neck seal
can be checked by removing the overflow hose at the
filler neck overflow nipple (Fig. 30). Attach the radi-
ator pressure tester to the filler neck overflow
Fig. 28 Cooling System Pressure Cap
1 - OVERFLOW NIPPLE
2 - MAIN SPRING
3 - GASKET RETAINER
4 - STAINLESS-STEEL SWIVEL TOP
5 - RUBBER SEALS
6 - VENT VALVE
7 - COOLANT OUTLET CONNECTOR (2.0L/2.4L)/PRESSURE
CONTAINER (2.7L)
8 - FILLER NECK
Fig. 29 Testing Cooling System Pressure Cap
1 - PRESSURE CAP
2 - PRESSURE TESTER
JR
ENGINE
7 - 37
PRESSURE CAP (Continued)
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.
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.
CLEANING
Use only a mild soap to clean the pressure cap.
INSPECTION
CAUTION: Vehicles equipped with 2.0L/2.4L engines
use a different pressure cap than vehicles equipped
with 2.7L engines. The pressure caps are NOT inter-
changeable. Verify proper pressure cap part num-
ber.
2.0L/2.4L
Hold the cap in your hand, right side up (Fig. 31).
The vent valve at the bottom of the cap should fall
open. Turn the cap upside down. The vent valve
should close.
Replace the cap for any of the following conditions:
• Rubber gasket has swollen, preventing the valve
from opening
• Any light can be seen between the vent valve
and the rubber gasket (with cap upside down)
• Gasket on the bottom of the cap shows notice-
able thinning
• Cap has been through more than one engine
overheat.
2.7L
Hold the cap in your hand, right side up (Fig. 31).
The vent valve at the bottom of the cap should be
normally closed. The vent valve should open with a
slight pull with your finger nail.
Replace the cap for any of the following conditions:
• Rubber gasket has swollen, preventing the valve
from opening
• Any light can be seen between the vent valve
and the rubber gasket. Use only a replacement
cap that has a spring to hold the vent shut.
• Gasket on the bottom of the cap shows notice-
able thinning
• Cap has been through more than one engine
overheat.
Fig. 30 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 - COOLANT OUTLET CONNECTOR (2.0L/2.4L)/PRESSURE
CONTAINER (2.7L)
8 - FILLER NECK
7 - 38
ENGINE
JR
PRESSURE CAP (Continued)
RADIATOR FAN(S)
DESCRIPTION
The radiator fan module includes a support shroud
with two electrically driven motors with fan blades
(Fig. 32). The radiator fan module is fastened to the
radiator. The motors, shroud, and fan blades are ser-
viced separately.
OPERATION
The radiator fans are controlled by the Powertrain
Control Module (PCM) which energizes a high speed
or low speed fan relay. The electric motor drives the
cooling fan to produce air flow across the radiator
fins.
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - RADIATOR FAN
CONTROL
Fan control is accomplished three ways. The fan
runs when the air conditioning pressure reaches a
set psi see charts below. In addition to this control,
the fan is turned on by the temperature of the cool-
ant which is sensed by the coolant temperature sen-
sor which sends the message to the Powertrain
Control Module (PCM). The PCM turns on the fan
through a fan relay. On models equipped with auto-
matic transmission, a transmission fluid thermister
may have some influences on fan operation. See Wir-
ing Diagrams Manual for circuity and diagnostics
provided.
The Powertrain Control Module (PCM) provides
fan control for the following conditions:
• The fan will not run during cranking until the
engine starts no matter what the coolant tempera-
ture is.
• Fan will run when the air conditioning clutch is
engaged, low pressure cutout switch is closed and
once set compressor head pressure is reached. See
charts.
• Fan will run according to the following informa-
tion charts.
Fig. 31 Cooling System Pressure Cap - Typical
1 - FILLER NECK SEAL
2 - VACUUM VENT VALVE
3 - PRESSURE RATING
4 - PRESSURE VALVE
Fig. 32 Fan Module
1 - RADIATOR FAN MOTOR
2 - RADIATOR
3 - RADIATOR DRAINCOCK
JR
ENGINE
7 - 39
PRESSURE CAP (Continued)
RADIATOR FAN OPERATION—2.0L ENGINE
Radiator Fan Control
A/C Pressure
A/C Off
Low
High
Fan On:
104°C
(220°F)
110°C
(230°F)
Fan Off:
99°C
(210°F)
104°C
(220°F)
A/C On
Low
High
Low
High
Fan On:
99°C
(210°F)
110°C
(230°F)
1,466
Kpa
(209
psi)
1,717
Kpa
(249 psi)
Fan Off:
93°C
(200°F)
104°C
(220°F)
1,172
Kpa
(170
psi)
1,579
Kpa
(229 psi)
EATX Fluid Temperature
Low
Speed
High
Speed
Fan On:
109°C
(228°F)
111°C
(232°F)
Fan Off:
104°C
(220°F)
109°C
(228°F)
RADIATOR FAN OPERATION—2.4L ENGINE
Radiator Fan Control
A/C Pressure
A/C Off
Low
High
Fan On:
104°C
(219°F)
110°C
(230°F)
Fan Off:
99°C
(210°F)
105°C
(221°F)
A/C On
Low
High
Low
High
Fan On:
99°C
(210°F)
110°C
(230°F)
1,448
Kpa
(210
psi)
1,718
Kpa
(249 psi)
Fan Off:
93°C
(199°F)
105°C
(221°F)
1,207
Kpa
(175
Psi)
1,585
Kpa
(229
Psi)
EATX Fluid Temperature
Low
Speed
High
Speed
Fan On:
109°C
(228°F)
111°C
(232°F)
Fan Off:
104°C
(220°F)
109°C
(228°F)
RADIATOR FAN OPERATION—2.7L ENGINE
Radiator Fan Control
A/C Pressure
A/C Off
Low
High
Fan On:
104°C
(220°F)
110°C
(230°F)
Fan Off:
98°C
(208°F)
105°C
(221°F)
A/C On
Low
High
Low
High
Fan On:
99°C
(210°F)
110°C
(230°F)
1,448
Kpa
(210
psi)
1,718
Kpa
(249 psi)
Fan Off:
93°C
(199°F)
105°C
(221°F)
1,207
Kpa
(175
psi)
1,585
kpa (229
psi)
EATX Fluid Temperature
Low
Speed
High
Speed
Fan On:
109°C
(228°F)
111°C
(232°F)
Fan Off:
104°C
(220°F)
109°C
(228°F)
DIAGNOSIS AND TESTING - ELECTRIC FAN
MOTOR TEST
Refer to the appropriate Diagnostic Information for
testing the fan motor with the DRBIII
t.
For wiring diagrams of the fan motor systems refer
to Wiring Diagrams.
REMOVAL
(1) Remove upper radiator crossmember.
(2) Disconnect radiator fan electrical connector
(Fig. 33).
(3) Remove fasteners and upper clip attaching fan
assembly to radiator (Fig. 33).
(4) Remove
radiator
fan
assembly
by
lifting
upward.
INSPECTION
There are no repairs to be made to the fan. If the
fan is warped, cracked, or otherwise damaged, it
must be replaced with only the recommended
replacement part for adequate strength, performance
and safety.
7 - 40
ENGINE
JR
RADIATOR FAN(S) (Continued)
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