Jaguar X-Type Sedan and Estate (Wagon). Service manual — part 254

The thermostat is located in the thermostat housing which is bolted to the cylinder head and allows rapid engine warm-up by restricting
coolant flow through the radiator below 88°C (190°F). The thermostat also assists in keeping the engine operating temperature within
predetermined limits. The thermostat begins to open at 88°C (190°F) and is fully open at 102°C (216°F).

When the engine is cold and the thermostat is closed, coolant flows from the water pump through the engine. It then returns to the water
pump through the upper coolant hose.

When the engine is warm and the thermostat is open, coolant flows into the radiator through the upper coolant hose. It then returns to the
water pump from the radiator through the lower coolant hose and engine oil cooler.

The heater core is on a parallel circuit and is unaffected by the position of the thermostat.

Radiator

The radiator is of aluminium construction with plastic end tanks. Foam seals are fitted to the radiator to prevent the cooling air from by
passing the radiator core. The radiator is located by four isolator mountings and supported by the radiator support beam. A coolant drain
plug is provided in the lower coolant hose for the draining of the cooling system. The cooling fan motor and shroud is attached to the
radiator via retaining clips.

Electric Cooling Fans

Two variable speed electric cooling fans are housed in the cooling fan shroud for the cooling of the radiator. The speed of the electric
cooling fans is adjusted by the cooling fan control module, which is controlled by the engine control module (ECM).

The ECM determines the cooling fan speed by receiving inputs from the cylinder head temperature (CHT) sensor. The ECM sends a variable
pulse width modulated (PWM) signal to the cooling fan control module to operate the cooling fans at the required speed. The cooling fans
are operated at slow speed when the engine coolant temperature is at 95°C (203°F) and are operated at full speed when the engine coolant
temperature is at 105°C (221°F). A coolant temperature between these temperatures will cause the cooling fans to be operated at a speed
which is proportional to the engine coolant temperature.

When the engine is running with the CHT above 100°C (212°F), if the ignition switch is turned to the OFF position the cooling fans will
continue to operate for a time which is determined by the ECM.

If the PW M signal from the ECM to the cooling fan control module is between 7% and 95% the cooling fan control module will operate the
cooling fans at the required speed. If the PWM signal from the ECM to the cooling fan control module is below 3% and above 95% the
cooling fan control module will operate the cooling fans at maximum speed. If the PWM signal from the ECM to the cooling fan control
module is between 3% and 7% the cooling fans will not operate.

Coolant Recovery System

A pressurized coolant expansion tank system is used which continuously separates the air from the cooling system and replenishes the
system through the coolant expansion tank outlet hose, attached to the heater return hose.

A continuous vent from the engine and radiator to the coolant expansion tank prevents air locks from forming in the cooling system.

The coolant expansion tank serves as the location for:

service filling.
coolant expansion during warm-up.
air separation during operation.
system pressurization by the coolant pressure cap.

Engine Oil Cooler

The engine oil cooler is a oil to water type. The oil cooler is mounted to the oil filler housing an sealed with two O-ring seals.

The coolant supply for the engine oil cooler is through the radiator bottom hose.

Engine oil cooler thermostat

The engine oil cooler thermostat is located in the water pump housing and helps to reduce the warm-up time by limiting the coolant flow
through the lubrication system until the engine reaches it's optimum operating temperature. The engine oil cooler thermostat starts to open
at 75°C (167°F) and is fully open at 89°C (192°F).

Published: 11-May-2011

Engine Cooling - 2.0L Duratorq-TDCi/2.2L Duratorq-TDCi (110kW/150PS) - Puma -
Cooling System Draining, Filling and Bleeding

General Procedures

1.

W ARNING: W hen releasing the cooling system pressure, cover the

expansion tank cap with a thick cloth to prevent the possibility of scalding.
Failure to follow this instruction may result in personal injury.

• NOTE: Release the cooling system pressure by slowly turning the coolant
expansion tank cap a quarter of a turn.

Remove the coolant expansion tank cap.

2. Remove the radiator splash shield.

For additional information, refer to:

Radiator Splash Shield

(501-02 Front

End Body Panels, Removal and Installation).

3. Drain the cooling system.

Allow the coolant to drain into a suitable container.

4. Install the radiator drain plug.

5. Install the radiator splash shield.

For additional information, refer to:

Radiator Splash Shield

(501-02 Front

End Body Panels, Removal and Installation).

6. Remove the air cleaner assembly.

For additional information, refer to:

Air Cleaner

(303-12B Intake Air

Distribution and Filtering - 2.0L Duratorq-TDCi/2.2L Duratorq-TDCi
(110kW/150PS) - Puma, Removal and Installation).

7. Detach the wiring harness.

8. Remove the air cleaner mount bracket.

9. Loosen the cooling system air bleed screw.

10. Fill the coolant expansion tank until coolant emerges from the cooling

system air bleed screw.

11. Tighten the cooling system air bleed screw.

Tighten to 10 Nm.

12.

CAUTION: The engine cooling system must be maintained with

the correct concentration and type of anti-freeze solution to prevent
corrosion and frost damage.

Fill the coolant expansion tank to the Max mark.

13. Install the air cleaner mount bracket.

Tighten the retaining bolts.

14. Attach the wiring harness.

15. Install the air cleaner assembly.

For additional information, refer to:

Air Cleaner

(303-12B Intake Air

Distribution and Filtering - 2.0L Duratorq-TDCi/2.2L Duratorq-TDCi
(110kW/150PS) - Puma, Removal and Installation).

16. Start the engine and maintain an engine speed of 1500 revolutions per

minute (RPM) for 20 seconds.

17. Switch the engine off.

18. Fill the coolant expansion tank to 15mm above the MAX mark.

19. Install the coolant expansion tank cap.

20. Start the engine, allow the engine to idle for a two minutes.

21.

CAUTION: Observe the engine temperature gauge. If the engine

starts to over-heat switch off immediately and allow to cool. Failure to
follow this instruction may cause damage to the vehicle.

Raise the engine speed to 3000 RPM and maintain at 3000 RPM until the
engine cooling fan operates, while observing the engine temperature
gauge.

22.

CAUTION: Observe the engine temperature gauge. If the engine

starts to over-heat switch off immediately and allow to cool. Failure to
follow this instruction may cause damage to the vehicle.

Allow the engine to idle for a further five minutes.

23. Switch off the engine.

24. Allow the engine to cool.

25. Remove the coolant expansion tank cap.

26.

CAUTION: The engine cooling system must be maintained with

the correct concentration and type of anti-freeze solution to prevent
corrosion and frost damage.

Fill the coolant expansion tank to the Max mark.

27. Install the coolant expansion tank cap.