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. |
| 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.
- Disconnect the heater outlet coolant hose from the engine and connect the heater hose to a suitable hose pipe.
- Disconnect the heater inlet coolant hose from the engine and allow the coolant to drain into a suitable container.
- Turn the water supply valve to the hose ON and allow water pressure to flow through the heater core.
- Allow water pressure to flow through the heater core for approximately five minutes.
- Turn the water supply valve to the hose OFF and disconnect the hose pipe from the heater hose.
- Connect the heater inlet coolant hose to the engine.
- Connect the heater outlet coolant hose to the engine.
- Fill the cooling system as described using a 50% mixture of Jaguar Premium Cooling System Fluid, or equivalent meeting Jaguar specification ESE-M97B44-A and 50% distilled water.
- Test the system for correct heater performance with the specified engine cooling system conditions.
Radiator Backflushing
- Remove the radiator. For additional information, refer to.
- Invert the radiator.
- Connect a suitable hose pipe to the lower coolant hose connection of the radiator.
- Turn the water supply valve to the hose ON and allow water pressure to flow through the radiator.
- Allow water pressure to flow through the radiator for approximately five minutes.
- Turn the water supply valve to the hose OFF and disconnect the hose pipe from the radiator.
- Allow the coolant to drain from the radiator.
- Install the radiator. For additional information, refer to.
Engine Backflushing
Note. Make sure that the thermostat is removed before backflushing the engine.
- Position the high-pressure water hose into the engine through the engine return and backflush the engine.
- Connect a suitable hose pipe to the upper coolant hose connection of the engine.
- Turn the water supply valve to the hose ON and allow water pressure to flow through the engine.
- Allow water pressure to flow through the engine for approximately five minutes.
- Turn the water supply valve to the hose OFF and disconnect the hose pipe from the upper coolant hose connection of the engine.
- Connect the upper coolant hose to the engine.
- Fill the cooling system as described using a 50% mixture of Jaguar Premium Cooling System Fluid or equivalent, meeting Jaguar specification ESE-M97B44-A and 50% distilled water.
Water Pump
The water pump is of a conventional design and is located at the rear of the engine. It is driven by the L/H exhaust camshaft through the water pump drive pulley and belt. The water pump belt tension is maintained by an automatic drive belt tensioner. For additional information, refer to FRONT END BODY PANELS .
Thermostat
The thermostat is located in a housing in the upper coolant hose and allows rapid engine warm-up by restricting coolant flow through the radiator below 82 °C (180°F). The thermostat also assists in keeping the engine operating temperature within predetermined limits. The thermostat begins to open at 82 °C (180°F) and is fully open at 93 °C (199°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 coolant. The Cooling fan shroud is attached to the radiator.
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 are adjusted by the cooling fan motor control module, which is controlled by the engine control module (ECM).
The ECM determines the cooling fan speed by receiving inputs from the engine coolant temperature (ECT) sensor and the dual automatic temperature control module (DATC). The ECM sends a variable pulse width modulated (PWM) signal to the fan motor 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 ECT 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 PWM 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 be operated.
Engine Block Heater
For vehicle markets subject to very cold climate conditions, an engine block heater for connection to an external mains power supply, is fitted in place of the engine block drain plug.
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.
No manual bleed points are provided on the system.
The coolant expansion tank serves as the location for
- Service fill.
- Coolant expansion during warm-up.
- Air separation during operation.
- System pressurization by the coolant pressure cap.
- The coolant expansion tank is designed to have approximately 0.5 to 1 liter of air when cold to allow for coolant expansion.
Engine Oil Cooler
The engine oil cooler is a Modine oil to water type. The oil cooler is fitted between the oil filter housing and the oil filter and is a full flow system.
The coolant supply for the engine oil cooler is through the radiator bottom hose.
Scheme 112
Engine Coolant
The long life engine coolant is formulated to last for five years or 240,000 km (150,000 miles). The coolant is silicate free and orange in color. The long life engine coolant must not be mixed with conventional engine coolant.
- Verify the customer concern.
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- Visually inspect for obvious signs of mechanical or electrical damage.
- If the concern is not an electrical fault and is not visually evident, verify the concern and refer to the .
- If the concern is an electrical fault and is not visually evident, use a fault code reader to retrieve the fault codes before proceeding to the symptom chart.