Range Rover. Manual — part 291
AIR CONDITIONING
21
DESCRIPTION AND OPERATION
Condenser fans control diagram - fast speed
1. Relay 15 (ignition)
2. Dual pressure switch
3. Fuse 31 (battery power)
4. LH condenser fan
5. RH condenser fan
6. Fuse 36 (battery power)
7. Relay 14 (RH condenser fan)
8. Relay 13 (LH condenser fan)
Self tuning
Periodically, the ATC ECU performs a self tuning
routine of the temperature and distribution servos, to
accommodate bedding in of the flaps and their control
mechanisms. During the routine, operation of the
blowers is inhibited and the servos are driven through
their full range to re-calibrate their flap positions. The
routine is invoked at the beginning of the 1st, 10th,
20th, 50th, 100th, 500th and every subsequent 500th
start up. The routine should also be invoked, using
TestBook, after replacement of a temperature or
distribution servo.
Diagnostics
The ATC ECU continuously monitors the sensor,
servo and blower circuits for continuity and short
circuits. The feedback signals of the temperature and
distribution servos are also checked for plausibility at
each end of the servo travel range. If a fault is
detected the ATC ECU shows the handbook symbol
on the LCD and stores a related fault code in memory.
The fault codes can be retrieved using TestBook.
AIR CONDITIONING
1
FAULT DIAGNOSIS
AIR CONDITIONING FAULTS
This section covers mechanical and possible fuse
faults that could occur in the air conditioning system.
Visual checks of components within the system and
relevant fuses should be carried out before
undertaking detailed fault diagnosis procedures on
TestBook .
For details of possible faults to vent flap servo motors
that are common to heating, ventilation and air
conditioning systems.
See HEATING AND
VENTILATION, Fault diagnosis.
Symptom - Condenser Fan Motor Inoperative or Slow Running.
POSSIBLE CAUSE
REMEDY
1. Blown fuse.
1. Check and renew fuse 34.
2. Loose electrical connections.
2. Check and tighten all relevant connections.
3. Worn internal motor
components.
3. Renew fan motor.
Symptom - Condenser Fan Motor and/or Condenser Vibration.
POSSIBLE CAUSE
REMEDY
1. Fan motor and/or blades out of
alignment.
1. Check for visual damage.
2. Fan motor/s out of balance.
2. Balance fan motors.
3. Build up of debris on fan
blades.
3. Clean blades with a suitable non-inflammable cleaner.
4. Excessive wear of fan motor
bearings.
4. Renew condenser fan and motor assembly.
5. Condenser unit not mounted
securely.
5. Secure as necessary.
82
AIR CONDITIONING
NEW RANGE ROVER
2
FAULT DIAGNOSIS
Symptom - Compressor Clutch Inoperative
POSSIBLE CAUSE
REMEDY
1. Blown air conditioning system
fuse.
1. Check and renew fuse 8 or 17.
2. Loose electrical connections.
2. Check and tighten all electrical connections.
3. Defective electrical or
mechanical components.
3. Renew compressor.
4. Refrigerant circuit problem.
4. Check and rectify.
Symptom - Compressor Clutch Noisy
POSSIBLE CAUSE
REMEDY
1. Loose drive belt.
1. Check drive belt tensioner or renew drive belt.
2. Compressor not mounted
securely.
2. Secure as necessary.
3. Bearing in clutch pulley not
pressed in.
3. Renew compressor.
4. Clutch will not spin freely.
4. Renew compressor.
5. Oil on clutch face.
5. Check compressor seals for leaks; if apparent, renew compressor.
6. Slipping clutch.
6. Renew compressor.
7. Compressor pump seizing.
7. Renew compressor.
8. Icing.
8. Check for suction line frosting. Renew expansion valve or
receiver/drier, if necessary.
Symptom - Blower Motors Inoperative or Slow Running.
POSSIBLE CAUSE
REMEDY
1. Blown fuse.
1. Check and renew fuse 42 or 43.
2. Loose electrical connections.
2. Check and tighten all relevant connections.
3. Worn internal motor
components.
3. Renew blower motor/s.
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