DESCRIPTION AND OPERATION
RANGE ROVER 4.59
Air Distribution Motors
Unless manually overridden, operation of the air distribution motor is controlled
automatically by the ATC ECU. The ATC ECU (C2295) provides a feed to the following on
BW wires:
l The face level air distribution motor (C2133).
l The screen air distribution motor (C2134).
l The footwell air distribution motor (C2135).
The ATC ECU (C2295) provides an earth path for all three motors on B wires.
Air Recirculation Motor
Unless manually overridden, operation of the recirculation motor is controlled automatically
by the ATC ECU, using inputs from the pollution sensor and/or if rapid passenger
compartment cooling is required. The ATC ECU (C2295) provides a feed to the recirculated
air motor (C0006) on a BW wire. The ATC ECU (C2295) provides an earth path for the motor
(C0006) on a B wire.
Heater Coolant Temperature Sensors
Two heater coolant temperature sensors are fitted on 'Comfort' ATC systems; on RH one
LH. Both sensors are Negative Temperature Coefficient (NTC) sensors. The ATC ECU
(C0923) provides a feed to the RH (C2296) and LH (C0416) temperature sensors on a pair
of NB wires. By measuring the voltage returned on a YU (RH) and YR (LH) wire, the ATC
ECU (C0923) can determine the temperature of the air exiting both sides of the heater
matrix.
Coolant Valves
Two coolant valves are fitted to 'Comfort' ATC systems to control coolant flow to each side
of the heater matrix. Both are controlled by Pulse Width Modulated (PWM) signals from the
ATC ECU (C1629) on YN (LH) and YP (RH) wires.
Auxiliary Coolant Pump
The auxiliary coolant pump is used to ensure a satisfactory flow rate through the heater
matrix at low engine speeds. The ATC ECU (C1629) provides a feed to the pump (C2035)
on a UG wire. The pump (C2035) is earthed on an N wire.
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