Cooling JAGUAR X308 1998 2.G Owner's Guide

T
he cooling system for the supercharged engine is very similar
to the normally aspirated engine, but with the addition of a
water cooled, intake air charge cooling system. This comprises a radiator, an electrically operated water pump and two
charge air cooler assemblies (heat exchangers) - one for each bank. The system works independently, but is connected to the
main cooling system at the bottom hose to allow for therma l expansion and to help to prevent unwanted circulation.
The condenser for the air conditioning system fits between th e coolant main radiator and the charge air cooling system
radiator.
Cylinder Block Heater, Drain Location
ItemDe
scription
1Rad

iator - Intake Air Coolant
2Ele

ctrically Operated Coolant Pump
3Top Hose
4Charge Air Coo

lers -
Intake Air Cooling
5Fi
lling Point for Intake Air Cooling
6N

on-Return Valves - Heater
7Ele

ctrically Operated Coolant Pump
8Hea

ter Matrix
9Wate

r Valve - Heater Control
10EGR V

alve (when fitted)
11Thr

ottle Body
12Coolan

t Recovery Bottle
13H

eader/Expansion Tank
14Eng

ine Coolant Pump
15The

rmostat Housing
16Bottom

Hose
17Air Bleed

Pipes
18Rad

iator - Main Cooling System

The cooling
pack incorporates the radiator a
ssembly with integral transmission oil cool er (located in the radiator outlet tank),
an air conditioning condenser, and the cooling fans and cowl assembly.
The cooling pack on supercharged vehicles is the same as described above, but with the addition of a charge air cooler
coolant radiator located in front of the condenser.
Radiator Mounti
ng/Retention
T
he radiator is mounted on four rubber mounts, one on each
end of the upper and lower horizontal face. The two lower
mountings are supported on two isolated brackets mounted on the body; the lower cradle assembly has subsequently been
deleted.
A closing panel made from polypropylene, which retains the radiat or assembly, fits over the top of the radiator and is bolted
to the vehicle top panel.
Coolant Hoses - Engine

Whe r
e considered necessary, some hose conn
ections have an indication mark to ensure correct orientation of the hose when
being fitted.
All joints use spring-band clips, except small pipes on the bleed system joints - which use cobra clips. The heater feed and
return hoses use quick-connection unions.
Supply and return hoses for the heater are located between the cylinder banks.
A connection on the rear of the A-bank provides coolant supply for the electronic throttle and the EGR valve (where fitted).
The outlet from the electronic throttle connects to the return hose from the heater.
Cool
ant Header and Recovery Tanks
A recovery system comp
rising the header tank
and a recovery tank is fitted. The recove ry tank is located in front of the left
hand front wheel arch liner.
The header tank provides the cooling system filling point and carries the coolant level sensor. The pressure cap allows
controlled release of coolant to the re covery tank during normal operation.
The recovery tank accommodates the expansion of the system coolant during normal operation. On engine cool-down, the
coolant contracts and is returned to the main system.
Coo lin
g Fans
The two
rad
iator cooling fans are mounted in
a cowl assembly within the cooling module.
The fans are controlled by the ECM dependent on the demand fr om the cooling system (temperature) or the air conditioning
ItemDescrip
tion
1EGR
E
ngines
2Non
-
EGR Engines
3Hea
ter Connections

Engine Cooling - Engine Cooling
Diagn
osis and Testing
Related Faults / Codes

Adaptive
Fue
ling
Sym
p
tom Chart
Sy
m
ptom Chart
S
p
ecial Tool(s)

D
i
gital multimeter

Generi
c scan tool
Conditi
on
Possib
l
e Source
Acti
o
n
D
T
C P0171 System too lean bank
1 (A)
D T
C P0174 System too lean bank
2 (B)
Fuel delivery blockage Fu
el delivery pressure (low)
F
a
ulty injector (blocked)
Ai
r i
ntake system leak
F
u
el injector electrical fault
ECT sensor
faul
t
MAFM sensor fault IAT se
nsor fault

Thro
tt
le position sensor
fault
Mec hanica
l check
Mec
hanica
l check
Mec
hanica
l check
Mec
hanica
l check
Go t
o DTC P020
1 to 0208
Go t
o
DTC P0116 to 0118, P0125
Go t
o
DTC P0101 to 0103, P1104
Go t
o DTC P011
1 to 0113
Go t
o
DTC P0121 to 0123, P0222,
P0223
D T
C P0172 System too rich bank
1 (A)
D T
C P0175 System too rich bank
2 (B)
F u
el delivery pressure
(high)
F a
ulty injector (leaking)
F
u
el injector continuously
open
Ai r i
ntake system restricted

Fu
el injector electrical fault
ECT sensor
faul
t
MAFM sensor fault IAT sensor fault


Thrott

le position sensor
fault
Mec hanica
l check
Mec
hanica
l check
Mec
hanica
l check
Mec
hanica
l check
Go t
o DTC P020
1 to P0208
Go t
o
DTC P0116 to P0118, P0125
Go t
o
DTC P0101 to P0103, P1104
Go t
o DTC P011
1 to P0113
Go t
o
DTC P0121 to P0123, P0222,
P0223
Sy m
ptom
Possib
l
e Sources
Acti
o
n
D
T
C P0116 ECT circuit range / performance problem
Thermostat
Coo
l
ant level / contamination
Sensor out of range
Harness open circuit
Connector loose or corroded
*
*
*
*
*
GO to Pinpoint

Test A

*
D
T
C P0125 Insufficient coolant temperature for closed
loop fuel control
Thermostat
Coo l
ant level / contamination
Sensor out of range
Harness open circuit
Connector loose or corroded
*
*
*
*
*
GO to Pinpoint

Test A

*
D
T
C P0117 ECT circuit low input
Sensor o
p
en circuit
Harness open circuit
Harness short
*
*
*
GO to Pinpoint

Test B

*

Engine Cooling - Cooling System Draining,
Filling and Bleeding4.0L NA V8
- AJ27/3.2L NA V8 - AJ26
Gen
eral Procedures
Drain
Refill
1. O
pen the engine compartment and fit paintwork protection
sheets.
2. Ensure that the cooling system is cool and very carefully,
remove the pressure cap from the header tank.
3. Raise the vehicle.

4. Drain th
e coolant.
Pla

ce a coolant drain tray on
the floor, below the radiator
drain plug.
1. Remove the radiator drain plug. and allow the coolant to drain.

5. Fit a new seal to the
drain plug.
1. Remove the seal from the drain plug. and clean the plug face.
Fit a new seal.

6. Re
fit the radiator drain plug.
Cl

ean any coolant from the
underside of the vehicle.
Remove the drain tray.
7. Lower the vehicle.
1. Refill the cooling system with a 50% solution of water and
Jaguar Antifreeze / Corrosion Inhibitor ESD-M97B49-A.
1. Fill the cooling system at the header tank until the level stabilises at the top of the breather neck.

Allow at least 2 minutes f
or ai
r to purge from the system.
Top up the he
ader tank as re
quired and fit the pressure
cap.
2. Switch on the ignition, switch off the climate control system
and start the engine.
3. Run the engine at between 1500 and 2000 rpm until the
cooling fans operate.
4. Switch on the A/C system, set to maximum heat, and check
that heat is coming from the heat er at the fascia vents or the
footwell outlets.
5. Switch off the engine and allow it to cool down.
6. When cool, remove the pressure cap and top up the system as
necessary at the header tank.

7. If n e
cessary, fit new seals to the pressure cap.
1. Remove both O-rings from the pressure cap.
Fit and
fully seat new O-rings to the pressure cap.
8. Fit the pressure cap.
9. Remove the paintwork protection sheets and close the engine
cover.

Engine Cooling - Cooling System Draining, Filling and Bleeding4.0L SC V8 -
AJ26

Gen
eral Procedures
Drain
Refill
1. O
pen the engine compartment and fit paintwork protection
sheets.
2. Ensure that the cooling system is cool and very carefully,
remove the pressure cap from the header tank.
3. Raise the vehicle.

4. Drain th
e coolant.
Pla

ce a coolant drain tray on
the floor, below the radiator
drain plug.
1. Remove the radiator drain plug. and allow the coolant to drain.

5. Fit a new seal to the
drain plug.
1. Remove the seal from the drain plug. and clean the plug face.
Fit a new seal.

6. Re
fit the radiator drain plug.
Cl

ean any coolant from the
underside of the vehicle.
Remove the drain tray.
7. Lower the vehicle.
1. Refill the cooling system with a 50% solution of water and
Jaguar Antifreeze / Corrosion Inhibitor ESD-M97B49-A.
1. Remove the threaded plug and Dowty washer from the charge air cooler fill point.

• NOTE
: To ensure that
air is not drawn into the system during the following operations:
Do
not remove the cap from the header tank whilst the
charge air cooling system is open to atmosphere.
Do
not switch on the ignition when th
e charge air cooling system is open to atmosphere because the electrical
cooling pump may draw air into the system.
2. Fi
ll the cooling system at the header tank until the
level stabilises near the to p of the charge air cooler
fill point. This will take some time, as air is being
purged from the system.
Ensure that the head
er tank is full.
2. Fit the pressure cap to the header tank.

3. Pour coolant careful l
y into the charge air cooler fill point until
the system is full.
Fi t t
he plug and washer to the fill point.
4. Remove the pressure cap from the header tank.
5. Switch on the ignition and switch off the climate control
system.
Le ave
the ignition switched on (do not start the engine)
for at least 2 minutes to allow the air charge cooler
electric water pump to oper ate and to purge any air from
the air charge cooler radiator to the header tank. (This
operation will be repeated later)
6. Switch off the ignition for at least 1 minute.
7. Leave the ignition switched on (do not start the engine) for at
least 2 minutes to allow the air charge cooler electric water
pump to operate and to purg e any air from the air charge
cooler radiator to the header tank.
8. Top up the cooling system.
1. Top up the header tank and fit the pressure cap.
2. Remove the plug from the air charge cooler fill point. Pour coolant carefully into the air charge cooler fill
point until the system is full.
3. Fit the plug and washer to the fill point.

9.
R
un the engine at between 1500 and 2000 rpm until the
cooling fans operate.
10. Switch on the climate control system, set to maximum heat,
and check that heat is coming from the heater at the fascia
vents or the footwell outlets.
11. Switch off the engine and allow it to cool down.
12. When cool, remove the pressure cap and top up the system
as necessary at the header tank.

13
.
If necessary, fit new seals to the pressure cap.
1. Remove both O-rings from the pressure cap.
Fit and
fully seat new O-rings
to the pressure cap. Fit the
pressure cap.
14. Check that the pressure cap is fitted. Remove the plug from
the air charge cooler fill point. Pour coolant carefully into the air

charge cooler fill point until the system is full.
F
it the plug to the fill poin
t, using a new Dowty sealing
washer.
15. Remove the paintwork protection sheets and close the engine
cover.

Engine Cooling - Cooling System Draining and Vacuum Filling
Gene
ral Procedures
WARNING: To avoid having scalding ho t coolant or steam blowing 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 ba ck while the pressure is
released from the system. When certain al l the pressure has been released (still with a cloth) turn and remove the coolant
pressure cap from the coolant expansion tank. Failure to fo llow these instructions may result in personal injury.
• CAUTIONS:
The engine cooling syst em must be maintained with the correct concentration and type of anti-freeze solution to
prevent corrosion and frost damage. Failure to follow th is instruction may result in damage to the vehicle.
Engine coolant will damage the paint finished surfaces. If spilt, immediately remove the coolant and clean the area
with water.
• NOTE: Vehicles fitted with supercharged engines shown, V8 NA engines similar.
All vehicles
1. Set
the heater controls to maximum HOT.

2. WARN
ING: Relieve the cooling system pressure by
unscrewing the coolant pressure cap. Failure to follow this
instruction may result in personal injury.
Remove the coolant expans ion tank pressure cap.
3. Raise a
nd support the vehicle.

4. NOTE : Remov
e and discard the
radiator drain plug seal.
Drain the coolant into a suitable container.
Remove the radiato
r drain plug.
5. CAUTION: Do not over tighten the drain plug. Failure to
follow this instruction may result in damage to the vehicle.
• NOTE: Install a new radiator drain plug seal.
Install the coolant drain plug.