Land Rover Lesson 2 Auto Trans Coolingine Rover Manual

For additional airflow through the radiator matrix,
particularly when the vehicle is stationary, there is an
engine driven Viscous fan unit fitted to the rear of the
radiator. The fan is used for engine cooling and for Air
Conditioning (A/C) system cooling. The fan is mounted
using a left hand thread.
The viscous fan unit is electronically controlled by the
ECM to optimise fan speed for all operating conditions.
NOTE: If the electrical connections to the viscous fan
are disconnected the fan will idle and...

ENGINE COOLING SYSTEM OPERATION
Cooling System Coolant Flow, Without Engine Oil Cooler
(G421099) Technical Training118
Lesson 2 – PowertrainEngine Cooling 

Cooling System Coolant Flow, With Engine Oil Cooler
When the engine is running the coolant pump is driven
by the ancillary drive belt. This forces coolant to
circulate around the engine, heater and EOC, while the
thermostat and bypass valve are shut. As the temperature
and pressure increases the bypass valve is forced open
allowing coolant to circulate through the bypass valve.
When the temperature reaches 82°C (180°F) the main
thermostat begins to open, allowing coolant to circulate
through the main...

tank has an outlet hose which is connected into the
coolant circuit. This outlet hose returns the coolant to
the system when the engine cools.
Coolant flows through the radiator from the top right
hand tank to the bottom left hand tank and is cooled by
air passing through the matrix. The temperature of the
cooling system is monitored by the Engine Control
Module (ECM) via the Engine Coolant temperature
(ECT) sensor located in the cylinder head. The ECM
uses signals from this sensor to adjust fuelling...

Cooling System Component Layout
Heater hose, in and out1
Connections for rear heater2
Hose, radiator to expansion tank3
Throttle body4
EGR valve5
Bleed screw6
Hose, water outlet to cylinder block7
Water outlet pipe assembly8
Expansion tank9
Hose, heater to thermostat10
Cylinder block11
Water pump12
Engine CoolingLesson 2 – Powertrain
121Technical Training (G421100) 

Hose, radiator to thermostat13
Oil cooler14
Cooling fan15
Shroud, lower16
Transmission oil pipes17
Radiator18
Shroud, upper19
Hose, water outlet to radiator20
GENERAL
The cooling system employed is of the pressure relief
by-pass type, which allows coolant to circulate around
the engine and the heater circuit while the thermostat
main valve is closed. The primary function of the
cooling system is to maintain the engine within an
optimum temperature range under changing ambient
and engine operating...

For additional airflow through the radiator matrix,
particularly when the vehicle is stationary, there is an
engine driven electro-viscous unit. This unit functions
as a normal viscous fan, but with electronic control over
the level engagement of the clutch. The Engine Control
Module (ECM), which determines the required fan
speed, controls the level of clutch engagement. The
ECM determines engagement based on the coolant,
ambient and transmission oil temperatures and air
conditioning (A/C) system...

ENGINE COOLING SYSTEM OPERATION
Cooling System Coolant Flow
(G421100) Technical Training124
Lesson 2 – PowertrainEngine Cooling 

When the engine is running the coolant pump is driven
by the ancillary drive belt. This forces coolant to
circulate around the engine and heater, while the
thermostat and bypass valve are shut. As the temperature
and pressure increases the bypass valve is forced open
allowing coolant to circulate through the bypass valve.
When the temperature reaches 82°C (180°F) the main
thermostat begins to open allowing coolant to circulate
through the main radiator. As the thermostat
progressively opens (fully open...

Cooling System Component Layout – Manual Gearbox Without Fuel Burning Heater (FBH)
Heater hose, in and out1Heater hose, in and out, for vehicles with rear
heater (optional)
2
(G421101) Technical Training126
Lesson 2 – PowertrainEngine Cooling