Range Rover. Manual — part 281
HEATING AND VENTILATION
1
FAULT DIAGNOSIS
HEATING AND VENTILATION FAULTS
This section covers mechanical, fuse and possible
flap servo motor faults that could occur in the heating
and ventilation system.
Visual checks of components within the system and
relevant fuses should be carried out before
undertaking detailed fault diagnosis procedures on
TestBook.
Symptom - Heater Emits Cold Air Only, Driver Or Passenger Sides.
POSSIBLE CAUSE
REMEDY
1. Engine running cold.
1.
See COOLING SYSTEM, Fault diagnosis.
2. Heater pipes or hoses blocked.
2. Clear or renew heater pipes and hoses.
3. LH or RH temperature vent
flaps in closed position due to
inoperative servo motor.
3. Renew servo motor.
4. Blown heating and ventilation
system fuse.
4. Check and renew fuses 8 or 17.
Symptom - Heater Emits Hot Air Only, Driver Or Passenger Sides.
POSSIBLE CAUSE
REMEDY
1. LH or RH temperature vent
flaps in open position due to
inoperative servo motor.
1. Renew servo motor.
2. Blown heating and ventilation
system fuse.
2. Check and renew fuses 8 or 17.
Symptom - Heater Emits Hot or Cold Air To Demist Only.
POSSIBLE CAUSE
REMEDY
1. Heater distribution vent flap
locked in ’demist’ position due
to inoperative servo motor.
1. Renew servo motor.
2. Blown heating and ventilation
system fuse.
2. Check and renew fuses 8 or 17.
80
HEATING AND VENTILATION
NEW RANGE ROVER
2
FAULT DIAGNOSIS
Symptom - Heater Emits Hot or Cold Air To Footwell Only.
POSSIBLE CAUSE
REMEDY
1. Heater distribution vent flap
locked in ’footwell’ position due
to inoperative servo motor.
1. Renew servo motor.
2. Blown heating and ventilation
system fuse.
2. Check and renew fuses 8 or 17.
Symptom - Heater emits hot or cold air to fascia vents only.
POSSIBLE CAUSE
REMEDY
1. Heater distribution vent flap
locked in ’fascia’ position due
to inoperative servo motor.
1. Renew servo motor.
2. Blown heating and ventilation
system fuse.
2. Check and renew fuses 8 or 17.
Symptom - Heater Emits Hot or Cold Air To Fascia and Footwell Vents Only.
POSSIBLE CAUSE
REMEDY
1. Heater distribution vent flap
locked in ’fascia/footwell’
position due to inoperative
servo motor.
1. Renew servo motor.
2. Blown heating and ventilation
system fuse.
2. Check and renew fuses 8 or 17.
Symptom - Heater Emits Recirculate Air Only.
POSSIBLE CAUSE
REMEDY
1. Air inlet housing vent flap
locked in closed ’recirculate’
position due to inoperative
servo motor.
1. Renew servo motor.
2. Blown heating and ventilation
system fuse.
2. Check and renew fuses 8 or 17.
HEATING AND VENTILATION
3
FAULT DIAGNOSIS
Symptom - Heater Emits Ambient Air Only
POSSIBLE CAUSE
REMEDY
1. Air inlet housing vent flap
locked in ’open’ position due to
inoperative servo motor.
1. Renew servo motor.
2. Blown heating and ventilation
system fuse.
2. Check and renew fuses 8 or 17.
Symptom - No Boosted Air Supply To Heater Distribution Unit.
POSSIBLE CAUSE
REMEDY
1. Blower motor(s) inoperative.
1. Renew blower motor(s).
2. Blown motor fuse.
2. Check and renew fuses 42 or 43.
3. Loose electrical connections.
3. Check and tighten all relevant connections.
Symptom - Individual Heating and Ventilation Function/s Inoperative When Switch Control/s Are Used.
POSSIBLE CAUSE
REMEDY
1. Switch function faulty.
1. Renew switch control panel.
2. Switch control panel ECU
faulty.
2. Check and renew fuse 8 or fit new control panel.
Symptom - Heating and Ventilation System Inoperative.
POSSIBLE CAUSE
REMEDY
1. Blown heating and ventilation
system fuse.
1. Check and renew fuses 8 or 17.
2. Switch control panel ECU
faulty.
2. Check and renew fuse 8 or fit new control panel.
80
HEATING AND VENTILATION
NEW RANGE ROVER
4
FAULT DIAGNOSIS
Symptom - Poor Air Supply From Distribution Unit To Demist, Fascia or Footwell Vents.
POSSIBLE CAUSE
REMEDY
1. Air distribution ducting leaking
at joints or defective.
1. Repair sealing joints or renew ducting.
2. Check through 1.1-12.1.
2. Refer to 1.1 through to 12.1.
NOTE: Should any fault occur in the heating and ventilation system on vehicles fitted with air
conditioning a ’book’ and ’!’ symbol will be displayed on the switch control panel.
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