Water Pump
The water pump is of a conventional design and is driven by the crankshaft pulley through the accessory drive belt. The water pump belt tension is maintained by an automatic drive belt tensioner. Refer to Accessory Drive article.
Thermostat
The thermostat is located in the thermostat housing 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. On the 4.2L supercharged engine the thermostat begins to open at 84°C (183°F) and is fully open at 98°C (208°F), on the 4.2L and 2.5 or 3.0L engine the thermostat begins to open at 88°C - 92°C (190°F - 198°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 aluminum construction with plastic end tanks. Foam seals are fitted to the radiator to prevent the cooling air from by passing the radiator core. A coolant drain plug is provided in the lower coolant end tank of the radiator for the draining of the coolant. The Cooling fan shroud is attached to the radiator.
Cooling Fan
A single, variable speed cooling fan motor is attached to a fan shroud located behind the radiator. The speed is determined by the Engine Coolant Temperature (ECT) and the air conditioning pressure and transmission oil temperature.
Under hot operating conditions, the fan may continue to operate for four minutes after the engine has been switched off.
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.
Manual bleed points are provided on the coolant reservoir.
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 on the 2.5 or 3.0L engine is located on the left-hand side of the engine and is fitted to the oil filter housing. The oil cooler on the 4.2L engine is located at the front of the engine and is fitted between the oil filter housing and the oil filter.
The coolant supply for the engine oil cooler is through the radiator bottom hose.
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.
Scheme 74
| Item Number | Description |
|---|---|
| 1 | Dual coolant flow valve |
| 2 | Water pump |
| 3 | Throttle body |
| 4 | V6 engine |
| 5 | Heater core |
| 6 | Engine oil cooler |
| 7 | Thermostat |
| 8 | Lower hose |
| 9 | Radiator |
| 10 | Coolant expansion tank |
| 11 | Upper hose |
| 12 | Top hose |
Scheme 75
| Item Number | Description |
|---|---|
| 1 | Dual coolant flow valve |
| 2 | EGR valve |
| 3 | Throttle body |
| 4 | Heater core |
| 5 | Water pump |
| 6 | Engine bank (left-hand) |
| 7 | Thermostat |
| 8 | Engine oil cooler |
| 9 | Lower hose |
| 10 | Coolant expansion tank |
| 11 | Radiator |
| 12 | Auxiliary coolant flow pump |
| 13 | Upper hose |
Scheme 76
| Item Number | Description |
|---|---|
| 1 | Dual coolant flow valve |
| 2 | EGR valve |
| 3 | Heater core |
| 4 | Throttle body |
| 5 | Charge air cooler (right-hand) |
| 6 | Water pump |
| 7 | Charge air cooler (left-hand) |
| 8 | Engine bank (left-hand) |
| 9 | Thermostat |
| 10 | Auxiliary coolant flow pump |
| 11 | Coolant expansion tank |
| 12 | Lower hose |
| 13 | Radiator |
| 14 | SC radiator |
| 15 | SC coolant pump |
| 16 | Upper hose |
Cooling System Backflushing - General Procedures
| 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.
- 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 WSS M97B44-D and 50% distilled water.
- Test the system for correct heater performance with the specified engine cooling system conditions.
Radiator Backflushing
- Remove the radiator. «Radiator - Removal and Installation»(ref-311313-S13389532492009032500000) .
- 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. «Radiator - Removal and Installation»(ref-311313-S13389532492009032500000) .
Engine Backflushing
- Remove the thermostat before backflushing the engine. «Thermostat - Removal and Installation (2.5L/3.0L)»(ref-311313-S37384767022009032500000) .
- 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 WSS M97B44-D and 50% distilled water.