Dodge Caliber. Manual — part 176
HEATER ENGINE BLOCK
DESCRIPTION
The heater is mounted in a core hole (in place of a
core hole plug) in the engine block, with the heating
element immersed in coolant.
The engine block heater is available as an optional
accessory. The heater is powered by ordinary house
current (110 Volt AC) through a power cord and con-
nector.
OPERATION
The block heater element is submerged in the cooling system’s coolant. When electrical power (110 volt A.C.) is
applied to the element, it creates heat. This heat is transferred to the engine coolant. This provides easier engine
starting and faster warm-up when vehicle is operated in areas having extremely low temperatures.
DIAGNOSIS AND TESTING
ENGINE BLOCK HEATER TESTING
If unit does not operate, trouble can be in either the power cord or the heater element. Test power cord for conti-
nuity with a 110-volt voltmeter or 110-volt test light; test heater element continuity with an ohmmeter or 12-volt test
light.
PM
ENGINE
7 - 29
REMOVAL
1. Drain the cooling system (Refer to 7 - COOLING/
ENGINE - STANDARD PROCEDURE).
2. Raise vehicle on hoist.
3. Detach power cord plug from heater (1).
4. Loosen screw (2) in center of heater. Remove
heater assembly (1).
INSTALLATION
1. Thoroughly clean core hole and heater seat.
2. Insert heater (1) assembly with element loop posi-
tioned upward.
3. With heater (1) seated, tighten center screw (2)
securely to assure a positive seal.
4. Connect power cord to block heater.
5. Lower vehicle.
6. Fill the cooling system (Refer to 7 - COOLING/EN-
GINE - STANDARD PROCEDURE).
7 - 30
ENGINE
PM
SENSOR ENGINE COOLANT TEMP
DESCRIPTION
WORLD ENGINE
There are two engine coolant sensors (ETC). One
ETC is located in the coolant adapter and one is
(ECT) sensor (1) threads into the cylinder head (1).
New sensors have sealant applied to the threads.
The ECT Sensor is a Negative Thermal Coefficient
(NTC) Sensor. The resistance of the ECT Sensor
changes as coolant temperature changes. This results
in different input voltages to the PCM. The PCM also
uses the ECT Sensor input to operate the radiator
cooling fan(s), and send a message over the PCI bus
to the instrument cluster for temperature gauge
operation.
OPERATION
The ECT sensor provides an input to the PCM. As temperature increases, resistance of the sensor decreases. As
coolant temperature varies, the ECT sensor resistance changes resulting in a different voltage value at the PCM
ECT sensor signal circuit. The ECT sensor provides input for various PCM operations. The PCM uses the input to
control air-fuel mixture, timing, and radiator fan on/off times. The ECT sensor input is also used for temperature
gauge operation.
PM
ENGINE
7 - 31
REMOVAL
CYLINDER HEAD MOUNTED
1. Disconnect negative battery cable.
2. Partially drain cooling system below level of ECT
Sensor (1).
3. Disconnect ECT Sensor electrical connector.
4. Remove ECT Sensor (1).
COOLANT ADAPTER MOUNTED
1. Disconnect negative battery cable.
2. Partially drain cooling system below level of ECT
Sensor (1).
3. Disconnect ECT Sensor electrical connector.
4. Remove ECT Sensor (1).
7 - 32
ENGINE
PM
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