Chrysler Pacifica. Manual — part 465
Poly-V Belt system may develop minor cracks
across the ribbed side (due to reverse bending). These
minor cracks are considered normal and acceptable.
Parallel cracks are not (Fig. 4).
NOTE: Do not use any type of belt dressing or
restorer on Poly-V Belts.
INSTALLATION
(1) Route and position the drive belt onto all pul-
leys, except for the crankshaft (Fig. 5).
Fig. 3 DRIVE BELT TENSION RELEASE
1 - BELT TENSIONER LUG
2 - WRENCH
Fig. 4 Drive Belt Inspection
1 - NORMAL CRACKS - BELT OK
2 - NOT NORMAL CRACKS - REPLACE BELT
Fig. 5 ACCESSORY DRIVE BELT
1 - GENERATOR
2 - IDLER PULLEY
3 - AUTOMATIC BELT TENIONER
4 - POWER STEERING PUMP PULLEY
5 - AIR CONDITIONING COMPRESSOR PULLEY
6 - CRANKSHAFT PULLEY
7 - ACCESSORY DRIVE BELT
8 - IDLER PULLEY
CS
ACCESSORY DRIVE
7 - 7
DRIVE BELTS (Continued)
(2) Rotate belt tensioner counterclockwise until
belt can be installed onto the crankshaft pulley (Fig.
3). Slowly release belt tensioner.
(3) Verify belt is properly routed and engaged on
all pulleys (Fig. 6).
(4) Install drive belt shield and lower vehicle.
IDLER PULLEY
REMOVAL
(1) Remove the accessory drive belt (Refer to 7 -
COOLING/ACCESSORY
DRIVE/DRIVE
BELTS
-
REMOVAL).
(2) Remove the bolt and the upper idler pulley.
(3) Remove the bolt and the lower idler pulley
(Fig. 7).
INSTALLATION
(1) Install bolt and loweridler pulley.
(2) Install bolt and upper idler pulley
(3) Install the accessory drive belt (Refer to 7 -
COOLING/ACCESSORY
DRIVE/DRIVE
BELTS
-
INSTALLATION).
Fig. 6 Accessory Drive Belt Routing
1 - GENERATOR
2 - AUTOMATIC TENSIONER
3 - POWER STEERING PUMP
4 - IDLER PULLEY
5 - A/C COMPRESSOR
6 - CRANKSHAFT PULLEY
Fig. 7 Idler Pulleys
1 - BOLT
2 - IDLER PULLEY
7 - 8
ACCESSORY DRIVE
CS
DRIVE BELTS (Continued)
ENGINE
TABLE OF CONTENTS
page
page
ENGINE
DIAGNOSIS AND TESTING - ENGINE
. . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
. . . . . . . . . . . . . . . . . . . . . . . . . . 13
COOLANT
DIAGNOSIS AND TESTING - COOLANT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
COOLANT RECOVERY PRESS CONTAINER
. . . . . . . . . . . . . . . . . . . . . . . . . 15
. . . . . . . . . . . . . . . . . . . . . . . . . . . 15
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
. . . . . . . . . . . . . . . . . . . . . . . . . 15
RADIATOR FAN
. . . . . . . . . . . . . . . . . . . . . . . . . . . 16
DIAGNOSIS AND TESTING - RADIATOR FAN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
. . . . . . . . . . . . . . . . . . . . . . . . . 17
ENGINE BLOCK HEATER
. . . . . . . . . . . . . . . . . . . . . . . . . 17
. . . . . . . . . . . . . . . . . . . . . . . . . . . 17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
. . . . . . . . . . . . . . . . . . . . . . . . . 18
ENGINE COOLANT TEMP SENSOR
. . . . . . . . . . . . . . . . . . . . . . . . . 18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
. . . . . . . . . . . . . . . . . . . . . . . . . 18
ENGINE COOLANT THERMOSTAT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
. . . . . . . . . . . . . . . . . . . . . . . . . 18
HEATER SUPPLY TUBE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
. . . . . . . . . . . . . . . . . . . . . . . . . 19
HOSE CLAMPS
. . . . . . . . . . . . . . . . . . . . . . . . . 20
. . . . . . . . . . . . . . . . . . . . . . . . . . . 20
RADIATOR
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
. . . . . . . . . . . . . . . . . . . . . . . . . 21
RADIATOR DRAINCOCK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
. . . . . . . . . . . . . . . . . . . . . . . . . 22
PRESSURE CAP
. . . . . . . . . . . . . . . . . . . . . . . . . 22
. . . . . . . . . . . . . . . . . . . . . . . . . . . 22
DIAGNOSIS AND TESTING - COOLING
SYSTEM PRESSURE CAP TESTING . . . . . . . 23
DIAGNOSIS AND TESTING - PRESSURE
CAP TO FILLER NECK SEAL . . . . . . . . . . . . . 23
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
. . . . . . . . . . . . . . . . . . . . . . . . . . 24
RADIATOR FAN RELAY
. . . . . . . . . . . . . . . . . . . . . . . . . 24
. . . . . . . . . . . . . . . . . . . . . . . . . . . 24
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
. . . . . . . . . . . . . . . . . . . . . . . . . 25
WATER PUMP
. . . . . . . . . . . . . . . . . . . . . . . . . 25
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
. . . . . . . . . . . . . . . . . . . . . . . . . . 25
. . . . . . . . . . . . . . . . . . . . . . . . . 26
ENGINE
DIAGNOSIS AND TESTING - ENGINE COOLING
SYSTEM
Establish what driving condition caused the cooling
system complaint. The problem may be caused by an
abnormal load on the system such as the following:
prolonged idle, very high ambient temperature, slight
tail wind at idle, slow traffic speed, traffic jam, high
speed, steep grade.
DRIVING TECHNIQUES
To avoid overheating the cooling system:
(1) Idle with A/C off when temperature gauge is at
end of normal range.
(2) Do not increase engine speed for more air flow
and coolant flow because the electric motor fan sys-
tems are not responsive to engine RPM. The added
cooling from higher coolant flow rate is more than
offset by increased heat rejection (engine heat added
to coolant).
TRAILER TOWING
Consult the owner’s manual under Trailer Towing
and do not exceed specified limits.
CS
ENGINE
7 - 9
VISUAL INSPECTION
If the cooling system problem is not caused by a
driving condition, perform a visual inspection to
determine if there was a recent service or accident
repair, including the following:
• Loose/damaged water pump drive belt
• Incorrect cooling system refilling (trapped air or
low level)
• Brakes possibly dragging
• Damaged hoses
• Loose/damaged hose clamps
• Damaged/incorrect engine thermostat
• Damaged cooling fan motor, fan blade and fan
shroud
• Damaged head gasket
• Damaged water pump
• Damaged radiator
• Damaged coolant recovery system
• Damaged heater core
• Open/shorted electrical circuits
If the visual inspection reveals none of the above
as cause for a cooling system complaint, refer to the
following diagnostic charts.
COOLING SYSTEM DIAGNOSIS CHART
CONDITION
POSSIBLE CAUSES
CORRECTION
PRESSURE CAP IS BLOWING
OFF STEAM AND/OR COOLANT.
TEMPERATURE GAUGE READING
MAY BE ABOVE NORMAL BUT
NOT HIGH. COOLANT LEVEL MAY
BE HIGH IN COOLANT RESERVE/
OVERFLOW TANK.
1. Pressure relief valve in pressure
cap is defective, or was not
properly seated.
1. Check condition of pressure cap
and cap seal. (Refer to 7 -
COOLING/ENGINE/RADIATOR
PRESSURE CAP - DIAGNOSIS
AND TESTING) Replace cap as
necessary.
2. Incorrect cap was installed.
2. Replace cap as necessary.
3. Incorrect coolant mixture.
3. Check concentration level of the
coolant. (Refer to 7 - COOLING/
ENGINE/COOLANT - DIAGNOSIS
AND TESTING) Adjust the ethylene
glycol-to-water ratio as required.
COOLANT LOSS TO THE
GROUND WITHOUT PRESSURE
CAP BLOWOFF. GAUGE IS
READING HIGH OR HOT.
1. Coolant leaks in radiator, cooling
system hoses, water pump or
engine.
1. Pressure test and repair as
necessary. (Refer to 7 - COOLING -
DIAGNOSIS AND TESTING)
DETONATION OR PRE-IGNITION
(NOT CAUSED BY IGNITION
SYSTEM). GAUGE MAY NOT BE
READING HIGH.
1. Engine overheating.
1. Check reason for overheating
and repair as necessary.
2. Freeze point of coolant not
correct. Mixture too concentrated or
too diluted.
2. Check concentration level of the
coolant. (Refer to 7 - COOLING/
ENGINE/COOLANT - DIAGNOSIS
AND TESTING) Adjust the ethylene
glycol-to-water ratio as required.
3. Incorrect cooling system
pressure cap.
3. Install correct pressure cap.
HOSE(S) COLLAPSE AS ENGINE
COOLS DOWN.
1. Vacuum created in cooling
system on engine cool-down is not
being relieved through coolant
recovery system.
1. (a) Pressure cap relief valve
stuck. (Refer to 7 - COOLING/
ENGINE/RADIATOR PRESSURE
CAP - DIAGNOSIS AND TESTING)
Replace as necessary.
(b) Hose between the radiator and
overflow container is plugged or
pinched. Clean and repair as
necessary.
7 - 10
ENGINE
CS
ENGINE (Continued)
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