Dodge Nitro. Manual - part 507

2. Attach one end of a hose to the draincock. Put the other end into a clean container. Open draincock and

drain coolant from radiator. This will empty the coolant reserve/overflow tank. The coolant does not have
to be removed from the tank unless the system is being refilled with a fresh mixture. When tank is empty,
remove radiator cap and continue draining cooling system.

FILLING-DIESEL

1. Tighten the radiator draincock and the cylinder block drain plug(s) (if removed).

2. Fill cooling system with the antifreeze mixture. Refer to DESCRIPTION . Fill pressure bottle to service

line and install cap.

3. With heater control unit in the HEAT position, operate engine with pressure bottle cap in place.

4. Add coolant to pressure bottle as necessary. Only add coolant to the pressure bottle when the engine is

cold. Coolant level in a warm engine will be higher due to thermal expansion.

FILLING-GAS

Remove radiator pressure cap and fill system, using 50/50 mixture of the appropriate fluid and distilled water.
Refer to DESCRIPTION .

Continue filling system until full. Do not spill coolant on drive belts or the generator. For cooling system
capacity,

CAUTION: Failure to purge air from the cooling system can result in an

overheating condition and severe engine damage.

NOTE:

The engine cooling system will push any remaining air into the coolant
bottle within about an hour of normal driving. As a result, a drop in coolant
level in the pressure bottle may occur.
If the engine cooling system overheats and pushes coolant into the
overflow side of the coolant bottle, this coolant will be sucked back into
the cooling system ONLY IF THE PRESSURE CAP IS LEFT ON THE
BOTTLE. Removing the pressure cap breaks the vacuum path between the
two bottle sections and the coolant will not return to cooling system.

NOTE:

The coolant bottle has two chambers. Coolant will normally only be in the
outboard (larger) of the two. The inboard chamber is only to recover coolant in
the event of an overheat or after a recent service fill. The inboard chamber
should normally be empty. If there is coolant in the overflow side of the coolant
bottle (after several warm/cold cycles of the engine) and coolant level is above
cold full when cold, disconnect the end of the overflow hose at the fill neck and
lower it into a clean container. Allow coolant to drain into the container until
emptied. Reconnect overflow hose to fill neck.

2007 Dodge Nitro R/T

2007 ENGINE Cooling - Nitro

Fill coolant recovery/reserve container to at least the MAX mark. It may be necessary to add coolant to the
recovery/reserve container after three or four warm up/cool down cycles to maintain coolant level between the
MAX and MIN mark. This will allow trapped air to be removed from the system.

CLEANING/REVERSE FLUSHING

Reverse flushing of the cooling system is the forcing of water through the cooling system. This is done using air
pressure in the opposite direction of normal coolant flow. It is usually only necessary with very dirty systems
with evidence of partial plugging.

CHEMICAL CLEANING

If visual inspection indicates the formation of sludge or scaly deposits, use a radiator cleaner (Mopar® Radiator
Kleen or equivalent) before flushing. This will soften scale and other deposits and aid the flushing operation.

REVERSE FLUSHING RADIATOR

Disconnect the radiator hoses from the radiator fittings. Attach a section of radiator hose to the radiator bottom
outlet fitting and insert the flushing gun. Connect a water supply hose and air supply hose to the flushing gun.

Allow the radiator to fill with water. When radiator is filled, apply air in short blasts allowing radiator to refill
between blasts. Continue this reverse flushing until clean water flows out through rear of radiator cooling tube
passages. For more information, refer to operating instructions supplied with flushing equipment. Have radiator
cleaned more extensively by a radiator repair shop.

REVERSE FLUSHING ENGINE

Drain the cooling system. See STANDARD PROCEDURE. Remove the thermostat housing and thermostat.
Install the thermostat housing. Disconnect the radiator upper hose from the radiator and attach the flushing gun
to the hose. Disconnect the radiator lower hose from the water pump. Attach a lead away hose to the water
pump inlet fitting.

CAUTION: The cooling system normally operates at 97-110 kPa (14-16 psi) pressure.

Exceeding this pressure may damage the radiator or hoses.

CAUTION: Be sure instructions on the container are followed.

CAUTION: The cooling system normally operates at 97-110 kPa (14 -16 psi) pressure.

Exceeding this pressure may damage the radiator or hoses.

CAUTION: Be sure that the heater control valve is closed (heat off). This is done to

prevent coolant flow with scale and other deposits from entering the
heater core.

2007 Dodge Nitro R/T

2007 ENGINE Cooling - Nitro

Connect the water supply hose and air supply hose to the flushing gun. Allow the engine to fill with water.
When the engine is filled, apply air in short blasts, allowing the system to fill between air blasts. Continue until
clean water flows through the lead away hose. For more information, refer to operating instructions supplied
with flushing equipment.

Remove the lead away hose, flushing gun, water supply hose and air supply hose. Remove the thermostat
housing. See REMOVAL. Install the thermostat and housing with a replacement gasket . See
INSTALLATION. Connect the radiator hoses. Refill the cooling system with the correct antifreeze/water
mixture . See STANDARD PROCEDURE.

INSPECTION

COOLING-INSPECTION

After performing a cleaning/flush procedure, inspect all hoses, clamps and connections for deterioration and
leaks. Inspect radiator and heater core for leaks.

SPECIFICATIONS

FILL VOLUMES

TORQUE SPECIFICATIONS

DESCRIPTION

SPECIFICATION

Metric

3.7L

13.2L

14.0 qts.

4.0L

13.2 L

14.0 qts.

2.8L Diesel

12.5 L

11.8 qts

DESCRIPTION

N.m

Ft. Lbs.

In. Lbs.

Engine Air Tubes

Turbocharger to Intercooler

4.7

Intercooler to Intake Manifold

4.7

Automatic Belt Tensioner to Mounting Bracket - 3.7L

Automatic Belt Tensioner Pulley Bolt - 3.7L

Accessory Drive Belt Idler Pulley Bolt - 2.8L Diesel

Accessory Drive Belt Tensioner Bolt - 2.8L Diesel

47.1

Viscous Fan Drive to Engine - 3.7L

Viscous Fan Drive to Engine - 2.8L Diesel

149

110

Cooling Fan Support Bolts

47.1

Block Heater Bolt - 3.7L

Transmission Oil/Condenser to Radiator Bolts

11.9

105

2007 Dodge Nitro R/T

2007 ENGINE Cooling - Nitro

SPECIAL TOOLS

Coolant Pressure Bottle to Plenum mounting Bolts -3.7L
only

8.5

Electric Fan to Fan Shroud Bolts

Fan Blade Assy. to Viscous Drive Bolts - 3.7L/2.8L HD
Cooling

23.7

210

Fan Shroud to Radiator Mounting Bolts

Radiator Upper Isolator to Crossmember - Bolts

10.7

Thermostat Housing Bolts

2.8L Diesel

27.5

3.7L

115

Water Pump Bolts

3.7L

Water Pump Housing Nuts - 2.8L Diesel

24.4

2007 Dodge Nitro R/T

2007 ENGINE Cooling - Nitro

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