2005 CHRYSLER CARAVAN cooling

(5) Install the upper radiator mounts to the cross-
member bolts, if removed. Tighten to 8 N´m (70 in.
lbs.).
(6) Install the radiator upper hose to the support
clip (2.4L engine).
RADIATOR FAN RELAY
DESCRIPTION
The radiator fan relay is a solid state type and is
located on the front bumper reinforcment (Fig. 21).
Refer to WIRING DIAGRAMS for a circuit sche-
matic.
OPERATION
The solid state radiator fan relay is controlled by
the Powertrain Control Module (PCM) by way of a
Pulse Width Modulated (PWM) signal. The relay con-
trol circuit supplies a 12 volt signal to the PCM. The
PCM then pulses the ground circuit to achieve fan on
time. The relay provides a voltage to the fan motors
which is proportional to the pulse width it receives
from the PCM. The duty cycle ranges from 30% for
low speed operation, then ramps-up to 100% for high
speed operation. This fan control system provides
infinitely variable fan speeds, allowing for improved
fan noise, A/C performance, better engine cooling,
and additional vehicle power.
To control operation of the relay, the PCM looks at
inputs from:
²Engine coolant temperature
²A/C pressure transducer
²Ambient temperature from the body controller
²Vehicle speed
²Transmission oil temperature
The PCM uses these inputs to determine when the
fan should operate and at what speed. For further
information on fan operation, (Refer to 7 - COOL-
ING/ENGINE/RADIATOR FAN - OPERATION).
REMOVAL
(1) Open hood.
(2) Disconnect and isolate the battery negative
cable.
(3) Remove the radiator crossmember to front fas-
cia closure panel.
(4) Disconnect the relay electrical connector (Fig.
21).
(5) Remove the rivet attaching the relay to the
front bumper beam (Fig. 21).
(6) Remove the relay.
INSTALLATION
CAUTION: The relay mounting location is designed
to dissipate heat. Ensure the relay is securely
attached to prevent relay ªthermalº shutdown and
relay damage, resulting in possible engine over-
heating.
(1) Position relay and install a new rivet (Fig. 21).
(2) Connect electrical connector to relay.
(3) Install closure panel and attaching screws.
(4) Connect negative cable to battery.
Fig. 21 Radiator Fan Relay
1 - FRONT FASCIA
2 - FAN RELAY
3 - RIVET
4 - A/C CONDENSER (FRONT SIDE)
RSENGINE7-31
RADIATOR FAN (Continued)

WATER PUMP - 2.4L
DESCRIPTION
The water pump has a cast aluminum body and
housing with a stamped steel impeller. The water
pump bolts directly to the block (Fig. 22). The cylin-
der block to water pump seal is provided by a rubber
O-ring. The water pump is driven by the engine tim-
ing belt.
REMOVAL
(1) Disconnect negative cable from battery.
(2) Raise vehicle on a hoist.
(3) Remove the right inner splash shield.
(4) Remove the accessory drive belts (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
REMOVAL).
(5) Drain the cooling system (Refer to 7 - COOL-
ING - STANDARD PROCEDURE).
(6) Support engine from the bottom and remove
right engine mount. (Refer to 9 - ENGINE/ENGINE
MOUNTING/RIGHT MOUNT - REMOVAL).(7) Remove right engine mount bracket (Fig. 23).
(8) Remove the timing belt (Refer to 9 - ENGINE/
VALVE TIMING/TIMING BELT AND SPROCKET(S)
- REMOVAL).
(9) Remove timing belt idler pulley.
(10) Hold camshaft sprocket with Special tool
C-4687 and adaptor C-4687-1 while removing bolt.
Remove both cam sprockets.
(11) Remove the timing belt rear cover (Refer to 9
- ENGINE/VALVE TIMING/TIMING BELT COV-
ER(S) - REMOVAL).
(12) Remove the generator and bracket (Fig. 23).
(13) Remove water pump to engine attaching
screws (Fig. 24).
CLEANING
Clean gasket mating surfaces as necessary.
INSPECTION
Replace water pump body assembly if it has any of
these defects:
(1) Cracks or damage on the body.
(2) Coolant leaks from the shaft seal, evident by
wet coolant traces on the pump body.
(3) Loose or rough turning bearing.
(4) Impeller rubs either the pump body or the
engine block.
(5) Impeller loose or damaged.
(6) Sprocket or sprocket flange loose or damaged.
INSTALLATION
(1) Install new O-ring gasket in water pump body
O-ring locating groove (Fig. 25).
CAUTION: Make sure O-ring is properly seated in
water pump groove before tightening screws. An
improperly located O-ring may be damaged and
cause a coolant leak.
(2) Assemble pump body to block and tighten
screws to 12 N´m (105 in. lbs.) (Fig. 24). Pressurize
cooling system to 103.4 Kpa (15 psi) with pressure
tester and check water pump shaft seal and O-ring
for leaks.
(3) Rotate pump by hand to check for freedom of
movement.
(4) Install the timing belt rear cover (Refer to 9 -
ENGINE/VALVE TIMING/TIMING BELT COVER(S)
- INSTALLATION).
(5) Install camshaft sprockets and torque bolts to
101 N´m (75 ft. lbs.) while holding camshaft sprocket
with Special tool C-4687 and adaptor C-4687-1.
Fig. 22 Water Pump
1 - CYLINDER BLOCK
2 - WATER PUMP
7 - 32 ENGINERS

(6) Install timing belt idler pulley and torque
mounting bolt to 61 N´m (45 ft. lbs.).
(7) Install the timing belt (Refer to 9 - ENGINE/
VALVE TIMING/TIMING BELT AND SPROCKET(S)
- INSTALLATION).
(8) Install the generator mount bracket. (Fig. 23)
(9) Install the generator.(10) Install right engine mount bracket and engine
mount (Refer to 9 - ENGINE/ENGINE MOUNTING/
RIGHT MOUNT - INSTALLATION).
(11) Fill the cooling system (Refer to 7 - COOLING
- STANDARD PROCEDURE).
(12) Install the accessory drive belts (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
INSTALLATION).
(13) Lower vehicle and connect battery cable.
Fig. 23 Generator Bracket
1 - BRACKET - ENGINE MOUNT 5 - BOLT
2 - BOLT 6 - TENSIONER - DRIVE BELT
3 - GENERATOR 7 - BOLT
4 - BOLT 8 - BOLT
RSENGINE7-33
WATER PUMP - 2.4L (Continued)

WATER PUMP - 3.3/3.8L
DESCRIPTION
The water pump has a die-cast aluminum body
and a plastic impeller. It bolts directly to the timing
chain case cover, using a rubber seal for sealing (Fig.
26). It is driven by the accessory drive belt.
REMOVAL
(1) Drain the cooling system. (Refer to 7 - COOL-
ING - STANDARD PROCEDURE)
(2) Remove the accessory drive belt shield.
(3) Remove the accessory drive belt. (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
REMOVAL)
(4) Remove water pump pulley bolts (Fig. 26).
NOTE: To remove the water pump pulley, it MUST
first be positioned between water pump housing
and drive hub. The pulley can then be removed with
the water pump assembly.
(5) Rotate pulley until openings in pulley align
with water pump drive hub spokes (Fig. 27). Move
pulley inward between pump housing and hub (Fig.
27).
(6) Position pulley to allow access to water pump
mounting bolts. Remove water pump mounting bolts
(Fig. 28).
(7) Remove water pump with the pulley loosely
positioned between hub and the pump body.
Fig. 24 Water Pump - 2.4L
1 - CYLINDER BLOCK
2 - WATER PUMP
Fig. 25 Water Pump Body
1 - IMPELLER
2 - WATER PUMP BODY
3 - O-RING LOCATING GROOVE
Fig. 26 Water Pump - 3.3/3.8L Engine
1 - WATER PUMP
2 - PULLEY - WATER PUMP
3 - BOLT - PULLEY
4 - BOLT - WATER PUMP
5 - SEAL - WATER PUMP
7 - 34 ENGINERS
WATER PUMP - 2.4L (Continued)

(8) Remove and discard the seal.
(9) Clean seal groove and sealing surfaces on
pump and timing chain case cover. Take care not to
scratch or gouge sealing surfaces.
CLEANING
Clean gasket mating surfaces as necessary.
INSPECTION
Replace the water pump if it has any of the follow-
ing defects.
(1) Damage or cracks on the pump body.
(2) Coolant leaks; this will be evident by a wet
stream of coolant running down the pump body and
components below. A thin stain below the weep hole
reservoir slot (Fig. 29) is considered normal opera-
tion.(3) Impeller rubs inside of chain case cover.
(4) Excessively loose or rough turning bearing.
NOTE: A weepage stain that is black, brown, or grey
is considered normal, if it is dry. If the weep
appears wet; pressure test the cooling system at
15±18 psi and observe the weep area. If weep area
remains unchanged, do not replace the water pump
for this condition. Replace the water pump, if a
steady flow of engine coolant is evident from the
weep hole/reservoir slot (Fig. 29) (shaft seal failure).
Be sure to perform a thorough analysis before
replacing water pump.
INSTALLATION
(1) Install new seal into water pump housing
groove (Fig. 30).
NOTE: The water pump pulley MUST be positioned
loosely between the pump housing and drive hub
BEFORE water pump installation.
(2) Position the water pump pulley loosely between
pump housing and drive hub (Fig. 27).
(3) Install water pump and pulley to the timing
chain case cover (Fig. 26). Tighten water pump bolts
to 12 N´m (105 in. lbs.).
(4) Position pulley on water pump hub. Install
bolts and tighten to 28 N´m (250 in. lbs.) (Fig. 26).
(5) Rotate pump by hand to check for freedom of
movement.
(6) Install the accessory drive belt. (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
INSTALLATION)
Fig. 27 Water Pump Pulley Positioning
1 - HUB - WATER PUMP
2 - PULLEY - WATER PUMP
Fig. 28 Water Pump Bolts - 3.3/3.8L Engine (Shown
Without Pulley)
1 - WATER PUMP
2 - BOLTS
Fig. 29 Water Pump Inspection - 3.3/3.8L Engine
RSENGINE7-35
WATER PUMP - 3.3/3.8L (Continued)

(7) Install drive belt shield.
(8) Fill the cooling system. (Refer to 7 - COOLING
- STANDARD PROCEDURE)
WATER PUMP INLET TUBE -
2.4L
DESCRIPTION
The 2.4L engine uses a metal tube to connect the
engine block to the lower radiator hose and heater
return (Fig. 31). The tube has an O-ring for block to
tube sealing and bolts attach the tube to the engine
block.
REMOVAL
(1) Drain the cooling system. (Refer to 7 - COOL-
ING - STANDARD PROCEDURE)
(2) Remove radiator upper hose to access the hose
connections at the inlet tube.
(3) Remove radiator lower (Fig. 7) and heater
hoses from the inlet tube (Fig. 32).
(4) Remove the two fasteners that hold the inlet
tube to the block.
(5) Rotate tube while removing the tube from the
engine block.
INSTALLATION
(1) Inspect the O-ring for damage before installing
the tube into the cylinder block (Fig. 31).
(2) Lube O-ring with coolant and install inlet tube
into the cylinder block opening (Fig. 31).(3) Install the two inlet tube fasteners and tighten
to 12 N´m (105 in. lbs.).
(4) Connect the radiator lower hose (Fig. 7) and
heater hose to inlet tube (Fig. 32).
(5) Install the radiator upper hose.
(6) Fill the cooling system. (Refer to 7 - COOLING
- STANDARD PROCEDURE)
Fig. 30 Water Pump Seal
1 - WATER PUMP HOUSING
2 - SEAL
3 - IMPELLER
Fig. 31 Water Pump Inlet Tube - 2.4L Engine
1 - O-RING
2 - WATER PUMP INLET TUBE
Fig. 32 Water Pump Inlet Tube Hose Connections
1 - WATER PUMP INLET TUBE
2 - HOSE - HEATER RETURN
3 - COOLANT INLET
7 - 36 ENGINERS
WATER PUMP - 3.3/3.8L (Continued)

WATER PUMP INLET TUBE -
3.3/3.8L
REMOVAL
(1) Drain the cooling system. (Refer to 7 - COOL-
ING - STANDARD PROCEDURE)
(2) Raise vehicle on hoist and remove the belt
splash shield.
(3) Remove the radiator lower hose from inlet tube
(Fig. 33).
(4) Remove the oil cooler outlet/heater return hose
from inlet tube (only if equipped with engine oil
cooler) (Fig. 34).
(5) Remove the inlet tube bolts (Fig. 35).
(6) Remove the inlet tube (Fig. 35). Discard the
O-ring seal.
INSTALLATION
(1) Clean the inlet tube O-ring sealing surfaces on
the timing cover housing and tube.
(2) Apply MopartDielectric Grease or equivalent
to the O-ring before installation.
(3) Position new O-ring seal on inlet tube (Fig. 35).
(4) Install the inlet tube (Fig. 35). Tighten bolts to
28 N´m (250 in. lbs.).
(5) Connect radiator lower hose (Fig. 33) and
heater return hose (if equipped with engine oil
cooler) (Fig. 34) to the inlet tube.(6) Install the drive belt splash shield and lower
vehicle.
(7) Fill the cooling system. (Refer to 7 - COOLING
- STANDARD PROCEDURE)
Fig. 33 RAD HOSES TO ENGINE - 3.3/3.8L
1 - UPPER HOSE
2 - LOWER HOSE
Fig. 34 Engine Oil Cooler Hoses (Engine Oil Cooler
Equipped)
1 - OIL COOLER INLET TUBE
2 - INLET HOSE
3 - OIL COOLER OUTLET TUBE
4 - OUTLET HOSE
5 - WATER PUMP INLET TUBE
Fig. 35 WATER PUMP INLET TUBE
1 - TIMING CHAIN COVER
2 - INLET TUBE
3 - BOLT
4 - BOLT
5 - O-RING
RSENGINE7-37

(4) Remove the two bolts that secure the hood
latch to the front of the radiator closure panel cross-
member and move the latch out of the way over the
top of the crossmember. Mark the location of latch for
reinstallation.
(5) Using tool 8875A, disconnect the transmission
oil cooler line quick-connect fittings located on the
driver side of the A/C condenser from the transmis-
sion oil cooler (Refer to 7 - COOLING/TRANSMIS-
SION - STANDARD PROCEDURE -
TRANSMISSION COOLING).
(6) Using Tool 8875A, disconnect transmission oil
cooler line quick-disconnect fittings at the transaxle
(Refer to 7 - COOLING/TRANSMISSION - STAN-
DARD PROCEDURE).
INSTALLATION
(1) Position transmission cooler lines in vehicle.
(2) Install transmission cooler line at transaxle fit-
tings (Refer to 7 - COOLING/TRANSMISSION -
STANDARD PROCEDURE).
(3) Install transmission cooler lines at transmis-
sion oil cooler/condensor (Refer to 7 - COOLING/
TRANSMISSION - STANDARD PROCEDURE).
(4) Reposition the hood latch to the front of the
radiator closure panel crossmember.
(5) Install the two screws that secure the hood
latch to the front of the radiator closure panel cross-
member. Check and adjust the hood latch as needed.
Tighten the screws to 14 N´m (123 in. lbs.).
(6) Position the radiator sight shield onto the radi-
ator closure panel crossmember.(7) Install the five small screws that secure the
front fascia grille inserts to the radiator sight shield.
Tighten the screws to 2 N´m (17 in. lbs.).
(8) Install the two large screws that secure the
front fascia and the outboard ends of the radiator
sight shield to the radiator closure panel crossmem-
ber. Tighten the screws to 6 N´m (53 in. lbs.) (Fig. 4)
(9) Start engine and check transaxle fluid level.
Adjust fluid level as necessary.
Fig. 4 Radiator Sight Shield ± Typical
1 - LARGE SCREWS (2)
2 - SMALL SCREWS (5)
3 - RADIATOR SIGHT SHIELD
4 - GRILLE INSERTS
5 - FRONT FASCIA
7 - 40 TRANSMISSIONRS
TRANSMISSION OIL COOLER LINES (Continued)