Dodge Dakota (ND). Manual — part 128
CONTAINER-COOLANT RECOVERY
DESCRIPTION
The coolant recovery containeris integral to the upper
fan shroud assembly and is made of high temperature
plastic.
OPERATION
The coolant recovery container works in conjunction with the radiator pressure cap. It utilizes thermal 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. Coolant will then be
drawn from the coolant tank and returned to a proper level in the radiator.
REMOVAL
1. Remove RH radiator seal.
2. Remove coolant recovery container hose (2).
3. Disconnect washer pump electrical connector (3).
4. Remove coolant recovery container mounting bolts
(4) and clip.
5. Remove
coolant
recovery
container
(1)
from
vehicle
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ENGINE
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INSTALLATION
1. Position coolant recovery container(1) in vehicel.
2. Install coolant recovery container mounting bolts
and clip. Tighten bolts to 8.5 N·m (75 in. lbs.).
3. Connect washer pump electrical connector (3).
4. Connect coolant recover container hose (2) to radi-
ator.
5. Fill
collant
recover
container
with
windshield
washer fluid and with coolant (Refer to 7 - COOL-
ING - STANDARD PROCEDURE).
HEATER-ENGINE BLOCK
DESCRIPTION
WARNING: DO NOT OPERATE ENGINE UNLESS
BLOCK
HEATER
CORD
HAS
BEEN
DISCON-
NECTED 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 (1) (in place of a freeze plug) with the
heating element immersed in engine coolant. The cord
is attached to an engine compartment component with
tie-straps.
OPERATION
The heater warms the engine coolant providing easier engine starting and faster warm-up in low temperatures. Con-
necting the power cord to a grounded 110-120 volt AC electrical outlet with a grounded three wire extension cord
provides the electricity needed to heat the element..
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ENGINE
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DIAGNOSIS AND TESTING - ENGINE BLOCK HEATER
If the unit does not operate, 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) (1)
located on the sides of cylinder block above the oil
pan rail.
5. Remove power cord from block heater.
6. Loosen screw at center of block heater. Remove
heater assembly (1).
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ENGINE
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INSTALLATION
1. Install block drain plugs.
2. Thoroughly clean cylinder block core hole and
block heater seat.
3. Insert block heater assembly with element loop
pointing at twelve o’clock.
4. With block heater fully seated, tighten center screw
to 2 N·m (17 in. lbs.) torque.
5. Refill cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
6. Start and warm the engine. Check for leaks.
SENSOR-ENGINE COOLANT TEMPERATURE
DESCRIPTION
The Engine Coolant Temperature (ECT) sensor is used to sense engine coolant temperature. The sensor protrudes
into an engine water jacket.
The ECT sensor is a two-wire Negative Thermal Coefficient (NTC) sensor. Meaning, as engine coolant temperature
increases, resistance (voltage) in the sensor decreases. As temperature decreases, resistance (voltage) in the sen-
sor increases.
OPERATION
At key-on, the Powertrain Control Module (PCM) sends out a regulated 5 volt signal to the ECT sensor. The PCM
then monitors the signal as it passes through the ECT sensor to the sensor ground (sensor return).
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ENGINE
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