Jaguar XJ (X350). Manual — part 585

General procedures

Cooling System Backflushing

CAUTION: The heater core must be backflushed separately from the engine

cooling system to prevent the engine cooling system particles from clogging the heater
core tubes and reducing (or eliminating) coolant flow through the heater core. All engine
cooling system flushing and backflushing procedures must include a separate
backflushing of the heater core after the flushing or backflushing of the engine cooling
system.

CAUTION: Heater core internal pressure must not exceed 100 kPa (14.5 psi).

Failure to follow this instruction may cause damage to the heater core.

NOTE:

Cooling system backflushing should be carried out before the cooling system components
are installed after the cooling system flushing procedure.

1. Disconnect the heater outlet coolant hose from the engine and connect the heater hose to a
suitable hose pipe.


2. Disconnect the heater inlet coolant hose from the engine and allow the coolant to drain into
a suitable container.


3. Turn the water supply valve to the hose ON and allow water pressure to flow through the
heater core.


4. Allow water pressure to flow through the heater core for approximately five minutes.


5. Turn the water supply valve to the hose OFF and disconnect the hose pipe from the heater
hose.


6. Connect the heater inlet coolant hose to the engine.


7. Connect the heater outlet coolant hose to the engine.


8. Fill the cooling system as described using a 50% mixture of Jaguar Premium Cooling

System Fluid, or equivalent meeting Jaguar specification WSS M97B44-D and 50% distilled
water.


9. Test the system for correct heater performance with the specified engine cooling system
conditions.

Radiator Backflushing

1. Remove the radiator.



2. Invert the radiator.


3. Connect a suitable hose pipe to the lower coolant hose connection of the radiator.


4. Turn the water supply valve to the hose ON and allow water pressure to flow through the
radiator.


5. Allow water pressure to flow through the radiator for approximately five minutes.


6. Turn the water supply valve to the hose OFF and disconnect the hose pipe from the
radiator.


7. Allow the coolant to drain from the radiator.


8. Install the radiator.

Engine Backflushing

1. Remove the thermostat before backflushing the engine.



2. Position the high-pressure water hose into the engine through the engine return and
backflush the engine.

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3. Connect a suitable hose pipe to the upper coolant hose connection of the engine.


4. Turn the water supply valve to the hose ON and allow water pressure to flow through the
engine.


5. Allow water pressure to flow through the engine for approximately five minutes.


6. Turn the water supply valve to the hose OFF and disconnect the hose pipe from the upper
coolant hose connection of the engine.


7. Connect the upper coolant hose to the engine.


8. Fill the cooling system as described using a 50% mixture of Jaguar Premium Cooling
System Fluid or equivalent, meeting Jaguar specification WSS M97B44-D and 50% distilled
water.

Cooling System Draining, Filling and
Bleeding

1.

WARNING: Never remove the coolant pressure cap under any circumstances

while the engine is operating. Failure to follow this instruction may result in personal
injury. To avoid having scalding hot coolant or steam blow out of the cooling system, use
extreme care when removing the coolant pressure cap from a hot cooling system. Wait
until the engine has cooled, then wrap a thick cloth around the coolant pressure cap and
turn it slowly until the pressure begins to release. Step back while the pressure is
released from the system. When certain all the pressure has been released (still with a
cloth) turn and remove the coolant pressure cap from the coolant expansion tank.
Failure to follow these instructions may result in personal injury.

WARNING: To avoid the possibility of personal injury, do not operate the engine

with the hood open until the fan blades have been examined for cracks and separation.
Failure to follow this instruction may result in personal injury.

WARNING: Remove fuse 14 from the engine compartment fuse box prior to

performing any under hood service in the area of the cooling fan when the engine is hot,
since the cooling fan motor could operate if the engine has been switched OFF. Failure
to follow this instruction may result in personal injury.

CAUTION: The engine cooling system must be maintained with the correct

concentration and type of anti-freeze solution to prevent corrosion and frost damage.
Failure to follow this instruction may result in damage to the engine.

CAUTION: Never remove the coolant pressure cap under any circumstances

while the engine is operating. Failure to follow this instruction may result in damage to
the engine.

Release the cooling system pressure.

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Remove the coolant expansion tank pressure cap.

2. Remove the radiator splash shield.
Radiator Splash Shield (76.22.90)


3. Remove the coolant drain plug.

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