coolant reservoir JAGUAR S TYPE 1999 1.G Powertrain Manual

V6 EngineAJ-V6/AJ28
31
J.303.1365
Engine Cooling
Cooling System
Engine cooling is via a conventional re-circulation
system between the engine assembly and front
mounted coolant to air radiator. Coolant flow is
from the front of the engine, dividing to pass
around each bank of cylinders towards the rear
and then flowing forward through the cylinder
heads. The coolant from the engine returns to the
top RH side of the radiator, by-pass circuit and
also provides the hot input feed to the cabin
V6 ENGINE COOLING SYSTEMheater system. The bottom hose feeds coolant
from the radiator via the thermostat to the
coolant pump and also provides the cooling
circuit for the oil. A differential pressure orifice in
the bottom hose causes a flow through the engine
mounted oil cooler.
A coolant reservoir system (or de-gas system) is
used which is similar to previous (pre 1998MY)
vehicles.
The reservoir bottle is mounted at the rear left
1. Radiator
2. Top hose
3. Bottom hose
4. Thermostat
5. Coolant Pump
6. Engine oil cooler7. Reservoir bottle
8. Electronic throttle
9. V6 engine
10. Heater control valve
11. Heater unit
12. Bleed valve
1
10
5
11
9
4
6
2
3
8
12
7
J.303.1365

V6 EngineAJ-V6/AJ28
33
J.303.1378
HOSE LAYOUT
D.303.1378
Electronic Throttle
Top Hose
Bottom HoseFrom Heater
Control Valve
To
Reservoir
Bottle
Engine Coolant Outlet
A cast aluminium outlet junction bolts to both
cylinder heads to provide a single return flow to
the radiator top hose assembly.
D.303.1353
ENGINE COOLANT OUTLET
D.303.1353
To Engine
From Engine
To Heater
Control
Valve
ThermostatCoolant Pump

V8 EngineAJ-V6/AJ28
49
Cooling System
The AJ28 engine retains the same basic cooling
system as the previous V8 engines but shares the
radiator, fan shroud assembly, de-gas circuit and
bottom hose oil cooler circulator features with the
V6. The coolant specified for the V6 is also
applicable to the V8 engine.
Particular features of the AJ28 cooling system are:
¥ The thermostat is located in the engine
mounted housing as in previous V8 engines.
¥ The thermostat housing is modified with an
extra stub pipe for the new heater returnhose.
¥ The throttle adaptor is heated from the main
cooling system to provide throttle de-icing.
¥ Both heater hoses, feed and return, are now
routed forward to the heater control valve.
¥ An electric pump is fitted in the heater
coolant circuit (ÔS-TYPE IntroductionÕ
Technical Guide).
¥ The coolant reservoir (de-gas bottle) is fitted
with a level sensor which provides a low level
warning on the instrument panel message
J.303.1366
V8 ENGINE COOLING SYSTEM
1. Radiator
2. Top hose
3. Bottom hose
4. Thermostat
5. Coolant pump6. Engine oil cooler
7. Reservoir bottle
8. Electronic throttle
9. V8 engine
10. AC/heater pump
110512
9
4
6
2
3
8
7
J.303.1365
11
13
11. Heater control valve
12. AC/heater unit
13. Bleed