A/C - Scraping Noise From Control Panel
No: 82/05/04/NASFGN LM412
Ref:
Issue: 1
Date: 20 December 2004
Heater Control Panel Fan Noise
AFFECTED VEHICLE RANGE:
New Range Rover (LM) Up to 4A164860
SITUATION:
NOISE COMING FROM CONTROL PANEL AREA
A customer may report a concern of a noise/scraping sound from the Heating, Ventilation and Air Conditioning (HVAC) control panel in the dash. The aspirator fan, located inside the control panel, can be out of tolerance and run off-center resulting in contact with the casing.
RESOLUTION:
INVESTIGATE SOURCE OF NOISE AN REPAIR
Should a customer express concern regarding the above, the control panel should be replaced. Refer to the Service Procedure detailed in this Bulletin.
PARTS INFORMATION:
DDW WARRANTY CLAIMS:
DDW requires the use of causal part numbers. Labor only claims must show the causal part number with a quantity of zero.
Normal warranty policy and procedures apply.
Material allowance is included in labor operation.
REPAIR PROCEDURE
REPLACE HVAC CONTROL UNIT
1. Verify the symptoms.
NOTE:
GTR lookup sequence is as follows:
GTR Home > NAS > Service Information/ LM New Range Rover/2004 > Workshop Manuals > Service Procedures> Bookmark "Heating and Ventilation" > "Repairs" > "Controls - heater (ECU)" link
2. Refer to GTR Workshop Manual section 80.10.02 and remove the HVAC control unit.
3. Note the control unit part number from the label and determine that the production date code is "E11" or lower. (Figure 1)
4. If the production date code is "E11" or lower, install a new unit of the correct replacement part number with a date code of "E12" or higher.
NOTE:
The battery must be capable of maintaining a full charge during the T4 programming process.
5. Verify the battery is fully charged (12.5v or greater).
6. Connect a battery charger set on a low amp current charge to maintain battery state during this process.
7. Connect 14 to the vehicle and start a diagnostic session.
8. Using 14 and Range Rover 14 disc or higher, observe all of the on-screen instructions presented and perform the following steps:
^ On the 14 Main Menu select "System Diagnostics - Air Conditioning."
^ Select "Vehicle Maintenance."
^ Select "ECU Replacement." And follow on-screen instructions.
9. When the software download is complete, disconnect the battery charger and T4.
10. Verify proper operation of the HVAC control unit.