Range Rover V8 Cooling System Operation Guide
COOLING SYSTEM – V8
DESCRIPTION AND OPERATION
26-2-9
The engine driven fan contains a viscous coupling that allows the fan to slip as the engine speed increases. The fan
is attached to a threaded spigot on the pulley with a left hand threaded nut. The fan draws air through the radiator to
assist in cooling when the vehicle is stationary.
An electric fan controlled by the engine management system is fitted in front of the radiator assembly.
ENGINE MANAGEMENT SYSTEM – V8, DESCRIPTION AND OPERATION, Bosch ME 7.2 Engine
Operation
With the engine running, the coolant pump pulley is driven by an ancillary drive belt. When the engine is cold, the
thermostat is closed and coolant is prevented from circulating through the radiator. Coolant is able to circulate through
the engine and the passenger compartment heater matrix via a thermostat bypass.
As the temperature increases the thermostat begins to open, allowing cool fluid to be drawn from the radiator bottom
hose through the pump and into the cylinder block and hot coolant to flow from the coolant pump housing to the
radiator via the radiator top hose, where it is cooled by air passing through the matrix. When the thermostat opens
fully, the full flow of coolant passes through the radiator.
Coolant is also drawn through the liquid cooled transmission fluid cooler and the liquid cooled alternator housing by
the coolant pump via the coolant circuit.
The increased coolant volume, created by heat expansion, is directed to the expansion tank through a bleed hose
from the top of the radiator. The expansion 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.
