Dodge Dakota (R1). Manual — part 255
ENGINE
TABLE OF CONTENTS
page
page
COOLANT RECOVERY CONTAINER
ENGINE BLOCK HEATER - 3.9L/5.9L
ENGINE BLOCK HEATER - 4.7L
ENGINE BLOCK HEATER. . . . . . . . . . . . . . . . . 35
ENGINE COOLANT TEMPERATURE SENSOR
ENGINE COOLANT THERMOSTAT - 2.5L
THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . 38
ENGINE COOLANT THERMOSTAT - 3.9L/5.9L
THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . 40
ENGINE COOLANT THERMOSTAT - 4.7L
THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . 42
FAN DRIVE VISCOUS CLUTCH - 3.9L/4.7L/5.9L
VISCOUS FAN DRIVE . . . . . . . . . . . . . . . . . . . 45
RADIATOR
DIAGNOSIS AND TESTING . . . . . . . . . . . . . . . . . 47
RADIATOR COOLANT FLOW CHECK. . . . . . . . 47
RADIATOR PRESSURE CAP
RADIATOR CAP-TO-FILLER NECK SEAL . . . . . 50
RADIATOR CAP - PRESSURE TESTING . . . . . 50
RADIATOR FAN MOTOR
DIAGNOSIS AND TESTING . . . . . . . . . . . . . . . . . 51
ELECTRIC COOLING FAN . . . . . . . . . . . . . . . . 51
RADIATOR FAN RELAY
WATER PUMP - 2.5L
WATER PUMP - 3.9L/5.9L
WATER PUMP - 4.7L
RADIATOR FAN - ELECTRIC
RADIATOR FAN - VISCOUS
WATER PUMP INLET TUBE
7 - 32
ENGINE
AN
COOLANT RECOVERY
CONTAINER
DESCRIPTION
The coolant recovery containeris integral to the
upper fan shroud assembly and is made of high tem-
perature plastic (Fig. 1).
OPERATION
The coolant recovery container works in conjunc-
tion with the radiator pressure cap. It utilizes ther-
mal expansion and contraction of coolant to keep
coolant free of trapped air. It provides a volume for
expansion and contraction of coolant. It also provides
a convenient and safe method for checking coolant
level and adjusting level at atmospheric pressure.
This is done without removing the radiator pressure
cap. The system also provides some reserve coolant
to the radiator to cover minor leaks and evaporation
or boiling losses.
As the engine cools, a vacuum is formed in the
cooling system of both the radiator and engine. Cool-
ant will then be drawn from the coolant tank and
returned to a proper level in the radiator.
ENGINE BLOCK HEATER -
3.9L/5.9L
DESCRIPTION
WARNING: DO NOT OPERATE ENGINE UNLESS
BLOCK HEATER CORD HAS BEEN DISCONNECTED
FROM POWER SOURCE AND SECURED IN PLACE.
THE POWER CORD MUST BE SECURED IN ITS
RETAINING
CLIPS AND
ROUTED AWAY
FROM
EXHAUST MANIFOLDS AND MOVING PARTS.
An optional engine block heater is available on all
models. The heater is equipped with a power cord.
The heater is mounted in a core hole of the engine
cylinder block (in place of a freeze plug) with the
heating element immersed in engine coolant. The
cord is attached to an engine compartment compo-
nent with tie-straps.
The 3.9L and 5.9L gas powered engine has the
block heater located on the right side of engine next
to the oil filter (Fig. 2).
Fig. 1 Upper Fan Shroud with Integral Coolant
Recovery Container
1 - RADIATOR
2 - WASHER FLUID RESERVOIR
3 - COOLANT OVERFLOW/RESERVOIR
4 - FAN SHROUD (UPPER)
5 - SCREW
6 - INTERLOCKING PINS
7 - FAN SHROUD (LOWER)
Fig. 2 Engine Block Heater
1 - FREEZE PLUG HOLE
2 - BLOCK HEATER
3 - SCREW
4 - POWER CORD (120V AC)
5 - HEATING COIL
6 - OIL FILTER
AN
ENGINE
7 - 33
OPERATION
The heater warms the engine coolant providing
easier engine starting and faster warm-up in low
temperatures.
Connecting
the
power
cord
to
a
grounded 110-120 volt AC electrical outlet with a
grounded three wire extension cord provides the elec-
tricity needed to heat the element..
REMOVAL
(1) Disconnect battery negative cable.
(2) Drain coolant (Refer to 7 - COOLING - STAN-
DARD PROCEDURE).
(3) Remove power cord from heater by unplugging
(Fig. 3).
(4) Loosen (but do not completely remove) the
screw at center of block heater (Fig. 3).
(5) Remove block heater by carefully prying from
side-to-side. Note direction of heating element coil
(up or down). Element coil must be installed correctly
to prevent damage.
INSTALLATION
(1) Clean and inspect the block heater hole.
(2) Install new O-ring seal(s) to heater in gasoline
engines.
(3) Insert block heater into cylinder block.
(4) With heater fully seated, tighten center screw
to 2 N·m (17 in. lbs.).
(5) Fill cooling system with recommended coolant.
(Refer to 7 - COOLING - STANDARD PROCE-
DURE).
(6) Start and warm the engine.
(7) Check block heater for leaks.
ENGINE BLOCK HEATER - 4.7L
DESCRIPTION
WARNING: DO NOT OPERATE ENGINE UNLESS
BLOCK HEATER CORD HAS BEEN DISCONNECTED
FROM POWER SOURCE AND SECURED IN PLACE.
THE POWER CORD MUST BE SECURED IN ITS
RETAINING
CLIPS AND
ROUTED AWAY
FROM
EXHAUST MANIFOLDS AND MOVING PARTS.
An optional engine block heater (Fig. 4) is avail-
able with all models. The heater is equipped with a
power cord. The cord is attached to an engine com-
partment component with tie-straps. The heater
warms the engine providing easier engine starting
and faster warm-up in low temperatures. The heater
is mounted in a core hole of the engine cylinder block
in place of a freeze plug with the heating element
immersed in engine coolant.
Fig. 3 Engine Block Heater
1 - FREEZE PLUG HOLE
2 - BLOCK HEATER
3 - SCREW
4 - POWER CORD (120V AC)
5 - HEATING COIL
6 - OIL FILTER
Fig. 4 Engine Block Heater—4.7L
1 - ENGINE BLOCK HEATER
7 - 34
ENGINE
AN
ENGINE BLOCK HEATER - 3.9L/5.9L (Continued)
OPERATION
Connecting the power cord to a grounded 110-120
volt AC electrical outlet with a grounded, three wire
extension cord activates the heating element warm-
ing the engine coolant.
DIAGNOSIS AND TESTING—ENGINE BLOCK
HEATER
If the unit does not operate (Fig. 5), possible causes
can be either the power cord or the heater element.
Test the power cord for continuity with a 110-volt
voltmeter or 110-volt test light. Test heater element
continuity with an ohmmeter or a 12-volt test light.
CAUTION: To prevent damage, the power cord must
be secured in it’s retainer clips and away from any
components that may cause abrasion or damage,
such as linkages, exhaust components, etc.
REMOVAL
(1) Disconnect negative battery cable from battery.
(2) Drain coolant from radiator (Refer to 7 -
COOLING - STANDARD PROCEDURE).
(3) Raise vehicle.
(4) Remove engine cylinder block drain plug(s)
located on the sides of cylinder block above the oil
pan rail (Fig. 6).
(5) Remove power cord from block heater.
(6) Loosen screw at center of block heater. Remove
heater assembly (Fig. 7).
INSTALLATION
(1) Thoroughly clean cylinder block core hole and
block heater seat.
Fig. 5 Engine Block Heater 4.7L Engine
1 - ENGINE BLOCK HEATER
Fig. 6 Drain Plug - 4.7L Engine
1 - CYLINDER BLOCK DRAIN PLUG
2 - EXHAUST MANIFOLD AND HEAT SHIELD
Fig. 7 Engine Block Heater - 4.7L
1 - ENGINE BLOCK HEATER
AN
ENGINE
7 - 35
ENGINE BLOCK HEATER - 4.7L (Continued)
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