L322 Range Rover System Description and Operation
AIR CONDITIONING
DESCRIPTION AND OPERATION
82-19
Air Distribution
Forced Ventilation Outlets
The forced ventilation outlets promote the free flow of air through the passenger compartment. The outlets are
installed in the LH and RH rear quarter body panels and vent passenger compartment air into the sheltered area
between the rear quarter body panels and the rear bumper.
Rear Blower (High Line System Only)
The blower is installed between the front seats, in the rear face air duct, and consists of an open hub, centrifugal fan
powered by an electric motor. Operation of the electric motor is controlled by a thumbwheel on the rear passenger
face vent via the ATC ECU and an output stage (voltage amplifier) installed in the outlet of the fan.
The thumbwheel operates a variable potentiometer which outputs between 1.25 V (blower off) and 5 V (maximum
blower speed) to the ATC ECU. The ATC ECU then outputs a proportional control voltage between 0 and 5 V to the
output stage, which regulates a battery power feed from the rear blower relay to the blower to produce the related
blower speed.
The rear blower relay is installed in the rear fusebox and energised while the ignition is on.
