Dodge Nitro. Manual — part 520

ENGINE COOLANT TEMPERATURE SENSOR-INSTALLATION-2.8L DIESEL ENGINE

Fig. 50: Cylinder Head Assembly

2007 Dodge Nitro R/T

2007 ENGINE Cooling - Nitro

Courtesy of CHRYSLER LLC

1. Install coolant temperature sensor in thermostat housing.

2. Connect coolant temperature sensor electrical connector.

3. Refill cooling system. See STANDARD PROCEDURE.

4. Connect negative battery cable.

FAN-RADIATOR-ELECTRIC

DESCRIPTION

DESCRIPTION

1 - CYLINDER HEAD BOLT
2 - GLOW PLUG
3 - COOLANT FITTING
4 - CYLINDER HEAD ALIGNMENT DOWEL
5 - GLOW PLUG HARNESS
6 - CYLINDER LINER
7 - CYLINDER BLOCK
8 - CYLINDER HEAD GASKET
9 - CYLINDER HEAD
10 - ROCKER ARM ASSEMBLIES

2007 Dodge Nitro R/T

2007 ENGINE Cooling - Nitro

Fig. 51: Identifying Radiator, Electric Cooling Fan Connector, Fan Shroud & 2 Speed Electric Cooling
Fan
Courtesy of CHRYSLER LLC

The fan (4) is electrically controlled by the Powertrain Control Module (PCM) through the fan control relays.
The relays are located in the PDC in the engine compartment.

1 - RADIATOR
2 - ELECTRIC COOLING FAN CONNECTOR
3 - FAN SHROUD
4 - 2 SPEED ELECTRIC COOLING FAN

2007 Dodge Nitro R/T

2007 ENGINE Cooling - Nitro

OPERATION

OPERATION

The electric radiator cooling fan is controlled by the Powertrain Control Module (PCM) through the radiator
cooling fan relays. The PCM regulates fan operation based on input from the engine coolant temperature sensor,
battery temperature sensor, air conditioning select switch and vehicle speed.

The fan is not energized during engine cranking regardless of the electrical input from the temperature sensors
and air conditioning switch. However, if engine operation conditions warrant fan engagement, the fan will run
once engine starts.

On vehicles NOT equipped with AC: The relay is energized when the coolant temperature is above 80°C
(176°F), or battery temperature sensor above -12°C (10°F). It will then de-energize when coolant temperature
drops below 82°C (180°F), or battery temperature sensor below -9°C (16°F).

Vehicles Equipped with AC: In addition to using coolant temperature and battery temperature sensor to
control cooling fan operation, the cooling fan will also be engaged when the, air conditioning system is
activated. The relay is also energized when air conditioning is selected and coolant temperature is above 95°C
(203°F), or, air conditioning is selected and battery temperature sensor is above 41°C (106°F). It will then de-
energize when air conditioning is selected and coolant temperature is below 92°C (198°F), or air conditioning is
selected and battery temperature is below 38°C (100°F).

REMOVAL

REMOVAL

2007 Dodge Nitro R/T

2007 ENGINE Cooling - Nitro