Land Rover Defender Workshop Rover Manual

COOLINGSYSTEM
3
DESCRIPTION
ANDOPERATION
COOLANT
CIRCULATION
Operation When theengine isstarted fromcoldthethermostat
(2) prevents coolantcirculation throughtheradiator by
closing offthe tophose (6).During theengine warm
up period thewater pump (5)circulates coolanttothe
cylinders inthe crankcase andthrough separate ports
to the cylinder head.Atthe rear ofthe cylinder heada
proportion ofthe flow isdiverted throughaheater feed
pipe (16)tothe matrix ofthe heater unit(15). The
coolant isthen carried,...

26COOLING
SYSTEM
4 DESCRIPTION
ANDOPERATION
Operation To
engage anddisengage thefandrive thebi-metal
coil senses airtemperature behindtheradiator. When
a pre-determined temperatureisreached, thecoil
opens avalve (5)which allows fluidtoenter thedrive
area and,duetocentrifugal force,circulates tothe
annular drivearea.
There aretwo sets ofannular grooves (3),one inthe
drive clutch andtheother inthe drive body, aspecific
clearance beingprovided betweenthetwo sets of
grooves.
Viscous unitdisengaged...

COOLINGSYSTEM
1
ADJUSTMENT
DRAIN
ANDREFILL COOLING SYSTEM
Service repairno-26.10.01
Draining
WARNING: DONOT remove capsorplugs
when theengine ishot. Thecooling
system ispressurised andpersonal
scalding couldresult.
1.Remove expansion tankfillercap.
2. Position aclean container underradiator if
coolant isto be reused.
3. Disconnect radiatorbottomhoseandallow
coolant todrain.
NOTE: Achassis undertray maybefitted
on some vehicle derivatives toconform to
legal requirements. Whenunder chassis
remove andrefit...

COOLINGSYSTEM
1
REPAIR
VISCOUS
COUPLING ANDFAN
Service repairno-26.25.19 -Viscous coupling
Service repairno-26.25.05 -Fan
Remove
NOTE: Theviscous coupling hasaLH
thread.
1. Disconnect battery.
2. Using special pulleyrestraining toolLRT-12-094
and special spanner LRT-12-093 unscrew
viscous coupling frompulley hubadaptor thread.
3.Remove viscouscoupling andfanfrom vehicle.
NOTE: Ifair conditioning isfitted, thefan
cowl willalso need removing,
SeeFan
cowl
, with theviscous fanunit.
4. Ifrequired,...

26COOLING
SYSTEM
2 REPAIR
FAN
COWL
Service repairno-26.25.11
Remove 1. Disconnect battery.
2. Drain coolant.
SeeAdjustment, Drainand
refill cooling system.
3.Slacken retaining clipsandremove radiator top
hose.
4. Slacken retaining clipand remove tophose from
intercooler.
NOTE: Onvehicles fittedwithEGR system,
remove complete intercooler tophose
assembly.
5. Remove viscouscoupling andfan
See Viscous coupling andfan.
6.Remove 2nuts securing topoffan cowl.
7. Release expansion tankhose fromclips atbase
of...

COOLINGSYSTEM
3
REPAIR
WATER
PUMP
Service repairno-26.50.01
Remove 1. Disconnect battery.
2. Drain cooling system.
SeeAdjustment, Drain
and refill cooling system
3.Remove radiatortophose.
4. Remove intercooler tophose.
5. Slacken waterpump andpower steering pump
pulley retaining bolts.
6. Remove drivebelt.
SeeELECTRICAL, Repair,
Auxiliary drivebelt
7.Unscrew flangenutand remove belttensioner.
8. Remove oilfiller capand remove rockercover
insulation.
9. Slacken retaining clipand disconnect hoseat
heater...

26COOLING
SYSTEM
4 REPAIR
AUXILIARY
MOUNTING BRACKETANDGASKET
Service repairno-26.50.04
Remove 1. Disconnect battery.
2. Drain cooling system
SeeAdjustment, Drain
and refill cooling system
.
3. Remove radiatortophose.
4. Remove intercooler tophose.
5. Remove viscousfanunit.
See Viscous
coupling andfan
6.Remove fancowl.See Fancowl
7.Slacken powersteering pumppulley retaining
bolts.
8. Remove drivebelt.
SeeELECTRICAL, Repair,
Auxiliary Drivebelt
9.Unscrew 3bolts andremove powersteering
pump pulley.
10....

COOLINGSYSTEM
5
REPAIR
28.
Secure steering pumpandbracket toauxiliary
mounting bracket.
29. Fitsteering pumppulley.
30. Fitdrive belt
SeeELECTRICAL, Repair,
Auxiliary drivebelt
.
31. Fitfan cowl
See Fancowl.
32. Fitviscous fanunit
See Viscous coupling and
fan
.
33. Fitintercooler tophose.
34. Fitradiator tophose.
35. Refill cooling system.
SeeAdjustment, Drain
and refill cooling system
36.Reconnect battery. THERMOSTAT Service
repairno-26.45.01
Remove 1. Partially draincooling system, untilcoolant level...

26COOLING
SYSTEM
6 REPAIR
RADIATOR Service
repairno-26.40.01
Remove 1. Disconnect radiatorbottomhoseanddrain
cooling system.
SeeAdjustment, Drainand
refill cooling system
2.Disconnect radiatortophose.
3. Remove viscousfanunit.
See Viscous
coupling andfan
4.Remove fancowl.See Fancowl
5.Disconnect oilcooler pipes.Plugallconnections
to prevent oilspillage andingress ofdirt.
6. Disconnect topand bottom intercooler hoses.
7. Disconnect bleedhoseatradiator.
8. Remove 2bolts frombothsides securing
radiator...

COOLINGSYSTEM
7
REPAIR
EXPANSION
TANK
Service repairno-26.15.01
Remove 1. Position container tocollect coolant spillage.
2.Slacken retaining clipsanddisconnect both
hoses frombase ofexpansion tank.
3. Remove 3bolts securing expansion tankto
inside wingandmounting bracket.
4. Remove expansion tank.
Refit 5. Fitexpansion tanktoinside wingandmounting
bracket.
6. Fitboth hoses tobase oftank.
7. Check andtopupcooling system
See
SECTION 10,Maintenance, Underbonnet
maintenance