DESCRIPTION AND OPERATION
4.64 RANGE ROVER
COOLING FAN
DESCRIPTION
General
The electrically powered cooling fan is mounted on the front of the radiator and works in
conjunction with the cooling fan mounted on the front of the engine. Operation of the cooling
fan is controlled by the Engine Control Module (ECM). The ECM determines cooling fan
operating strategy after receiving inputs of Engine Coolant Temperature (ECT) from the
ECT sensor, and requests for extra engine cooling from the Automatic Temperature Control
(ATC) ECU via the K bus.
For more information on ATC operation, refer to the Automatic Temperature Control
(ATC) or Automatic Temperature Control – Comfort section of this manual.
+ AUTOMATIC TEMPERATURE CONTROL (ATC).
+ AUTOMATIC TEMPERATURE CONTROL (ATC) – COMFORT.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to maxi fuse 61, fuse 12, and
fuse 53 of the passenger compartment fuse box (C0632) on an R wire. Fuse 12 (C0586)
provides a constant battery feed to the ATC ECU (C1630) on an RP wire. Maxi fuse 61
(C0581) provides a constant battery feed to the cooling fan control unit (C0005) on an RU
wire.
Fuse 53 (C0583) provides a constant battery feed to the ignition switch (C0099 on Td6
vehicles, C0028 on V8 vehicles) by an R wire. When the ignition switch is turned to the
'ignition' position, current flows across the switch (C0099 on Td6 vehicles, C0028 on V8
vehicles) to fuse 34 of the passenger compartment fuse box (C0585) on a G wire. Fuse 34
(C0587) provides an ignition feed to the ATC ECU (C1629) on a GY wire.
Cooling Fan – Td6
Operation of the cooling fan is controlled by the ECM. The ECM monitors Engine Coolant
Temperature (ECT) to determine fan speed. The ECM (C0606) provides a feed to the ECT
sensor (C0169) on an SU wire. The ECT sensor is a Negative Temperature Coefficient
(NTC) sensor. By measuring the voltage returned on an NG wire, the ECM can determine
engine coolant temperature.
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