Jaguar XJ (X350). Manual — part 612

-> No

Verify the customer complaint.

PINPOINT TEST G557183p2 : THE
ENGINE OVERHEATS

G557183t2 : CHECK THE COOLANT LEVEL AND CONDITION

1. Check the coolant level and condition.

•

Does the system contain sufficient coolant of the correct specification?

-> Yes

GO to Pinpoint Test G557183t3.

-> No

Top-up the system,

Cooling System Draining, Filling and Bleeding Check for coolant loss. GO to Pinpoint Test

G557183p1.

G557183t3 : CHECK THE OPERATION OF THE COOLING SYSTEM PRESSURE
CAP

1. Check the opening pressure of the cooling system pressure cap. 2. NOTE:

Make sure the pressure is built up steadily when testing the pressure cap. Rapid increases in

pressure may indicate a failure in a correctly operating pressure cap.

Following the instructions for your workshop pressure tester, test the pressure cap to the pressure

indicated. 3. Check that the pressure cap holds to the pressure indicated, and releases once that

pressure is reached.

•

Does the pressure cap operate correctly?

-> Yes

GO to Pinpoint Test G557183t4.

-> No

INSTALL a new pressure cap. TEST the system for normal operation.

G557183t4 : CHECK THE OPERATION OF THE WATER PUMP

1. Remove the cooling system pressure cap and make sure there is sufficient coolant in the system. 2.

Make sure the parking brake is applied and Park or Neutral is selected. 3. Start the engine and hold

the engine speed at 1,500 to 2,000 rpm for one minute while observing the coolant through the

expansion tank filler neck. 4. Allow the engine to idle and switch off.

•

Is there coolant movement in the expansion tank while the engine is running?

-> Yes

GO to Pinpoint Test G557183t5.

-> No

Check the accessory drive belt condition and tension,

Accessory Drive - 2.7L Diesel

G557183t5 : CHECK THAT THE THERMOSTAT OPENS

1. Remove and inspect the thermostat.

Cooling System Draining, Filling and Bleeding

Thermostat (26.45.07) 2. Note the opening temperature and immerse the thermostat in water. 3.

Heat the water until this temperature is reached. The thermostat should begin to open.

•

Does the thermostat open?

-> Yes

Check the cooling fan, modules, circuits, sensors, etc,

Electronic Engine Controls

-> No

INSTALL a new thermostat,

Cooling System Draining, Filling and Bleeding

Thermostat (26.45.07) TEST the system for normal operation.

PINPOINT TEST G557183p3 : THE
ENGINE DOES NOT REACH NORMAL
OPERATING TEMPERATURE

G557183t6 : CHECK THAT THE THERMOSTAT CLOSES

1. Remove and inspect the thermostat.

Cooling System Draining, Filling and Bleeding

Thermostat (26.45.07) 2. Allow the thermostat to cool.

•

Does the thermostat fully close?

-> Yes

Check the cooling fans, modules, circuits, sensors, etc,

Electronic Engine Controls

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-> No

INSTALL a new thermostat,

Cooling System Draining, Filling and Bleeding

Thermostat (26.45.07) TEST the system for normal operation.

Removal and installation

Coolant Expansion Tank (26.15.01)

Removal

1

.

WARNING: 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 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 vehicle.

Remove the coolant expansion tank pressure cap.

2 . Using a suitable tool, drain the coolant out of the expansion tank.

3 . NOTE:

Cap the vent hose to minimize coolant loss.

Detach the vent hose.

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