A/C - Inconsistent Interior Temperatures
No: 82/01/02NASRef:
Issue: 1
Date: 02/22/02
Improved HVAC Temperature Sensor
AFFECTED VEHICLE RANGE:
Range Rover (LP) Up to 1A450120
SITUATION:
INCONSISTENT IN-VEHICLE TEMPERATURES
The customer may complain of too much heat in cold conditions or being too cold in hot conditions. The in-car temperature sensor is ventilated by a miniature fan, which draws air from inside the vehicle. The thrust bearing of the fan can wear prematurely, causing the fan to become stiff or sluggish. The starting torque of the motor is low, permitting the motor to sit in a stalled state. When the fan fails the sensor is not ventilated and the fascia temperature is sensed instead of the in-car temperature.
RESOLUTION:
REPLACE FAULTY IN-CAR TEMPERATURE SENSOR
NOTE:
The condition described in this TIB is NOT the "32 degree/snowflake" issue dealt with in TIB 80/01/98/NAS and Parts Bulletin PGI99-07. If a Range Rover HVAC appears to overheat or overcool intermittently and it has the latest head unit, suspect the aspirator.
Where a customer complaint of the above is confirmed, replace the temperature sensor with a new part.
PARTS INFORMATION:
JTF000030 Temperature sensor (includes fan) Qty 1
WARRANTY CLAIMS:
82.20.93 Time 0.60 hrs.
Install replacement fan/sensor assembly
FAULT CODE: D
Normal warranty policy and procedures apply.
Material allowance is included in labor operation.
REPAIR PROCEDURE
REPLACE FAN SENSOR UNIT
1. Use the smoke from an extinguished match or similar source to determine that the sensor motor has stalled.
2. Refer to Workshop Manual, Air Conditioning, section 82.20.93 and perform the fan/sensor replacement repair.