Jaguar XJ (X350). Service manual — part 591
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Radiator
•
Coolant pressure cap
•
Thermostat
•
Water pump
•
Electric cooling fan
•
Coolant expansion tank
•
Engine oil cooler
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.
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 3.5L or 4.2L and
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 aluminium 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:
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service fill.
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coolant expansion during warm-up.
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air separation during operation.
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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 3.0L engine is fitted to the
oil filter housing. The oil cooler on the 3.5L or 4.2L engine is located at the front of the engine and is
fitted between the oil filter housing and the oil filter. The oil cooler on the 4.2L engine with a
supercharger is fitted behind the front bumper on the front of the cooling pack.
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.
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Vehicles with 3.0L engine
Item
Part Number
Description
1
—
Water pump
2
—
Throttle body
3
—
V6 engine
4
—
Heater core
5
—
Engine oil cooler
6
—
Thermostat
7
—
Lower hose
8
—
Radiator
9
—
Coolant expansion tank
10
—
Upper hose
Vehicles with 3.5L or 4.2L engine
Item
Part Number
Description
1
—
EGR valve
2
—
Throttle body
3
—
Heater core
4
—
Water pump
5
—
Engine bank (left-hand)
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