A/C - Vibrating Noise at Highway Speeds
No: 82/01/05/NASFGN LM412
Ref:
Issue: 1
Date: March 16, 2005
AFFECTED VEHICLE RANGE:
Range Rover (LM) Up to 5A181087
SITUATION:
NOISE AT HIGHWAY SPEEDS FROM HVAC SYSTEM
A customer may report a concern of a noise from behind the instrument panel when the Heating Ventilation Air Conditioning (HVAC) is in Recirculation or Automatic mode. The noise is evident at road speeds of above 60 mph (100km/h). The HVAC recirculation flap seals may be vibrating against the heater body as incoming air passes over them.
RESOLUTION:
INSTALL FLAP SERVICE KIT
Should a customer express concern regarding a heater noise as described, follow the repair procedure in this bulletin to replace the HVAC seals.
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.
REPAIR PROCEDURE
INSTALL HVAC FLAP SERVICE KIT
NOTE:
GTR lookup sequence is as follows: GTR Home > NAS > Service Information/Lm Freelander/2004 > Workshop Manuals > Service Procedures > Bookmark "INTERIOR FITTINGS/REPAIRS" > "Fascia - carrier" link.
1. Refer to GTR section 76.46.22 and remove the instrument panel and carrier.
2. Select one side of the heater assembly to work on.
3. Release the securing clips and remove the selected side recirculation flap motor. (Figure 1)
NOTE:
The right-hand Bowden cable is blue and the left hand cable is green.
4. Remove the Bowden cable from the securing clip on the recirculation flap housing. (Figure 2)
5. Using long-nosed pliers perform the following: (Figure 3)
^ (1) Gently squeeze the central tags of the flap operating cam together.
^ (2) Release the cable from the flap operating cam.
6. Using long-nosed pliers perform the following: (Figure 4)
^ (1) Gently release the tags inside the operating cam center.
^ (2) Remove the recirculation flap operating cam from the recirculation flap-arm.
7. Rotate the flap forward to gain access to the recirculation flap-spindle, lower mounting. (Figure 5)
CAUTION:
Care must be exercised to avoid damaging the components behind the recirculation flap, or the flap spindle-mounting.
8. Using a lever, gently ease the recirculation flap spindle out of the lower mounting.
9. Rotate the flap to the open position and release the flap-spindle from the top mounting. (Figure 6)
10. Remove the flap from the HVAC housing.
NOTE:
The new recirculation flap is identified by an "L" for the left-hand side flap and "R" for the right-hand side flap.
11. Install the new flap assembly into the HVAC housing as follows:
^ Insert the top flap-spindle into the top mounting.
^ Ease the lower flap-spindle into the lower spindle mounting.
NOTE:
The new operating cam supplied in the service repair kit, is designed to locate onto the recirculation flap-arm in one position only.
12. Install the new operating cam.
NOTE:
The right-hand Bowden cable is blue and the left hand cable is green.
13. Install the operating rod and Bowden cable.
14. Install the recirculation flap motor.
15. Repeat steps 2 - 14 for the alternate side recirculation flap.
16. Refer to GTR Workshop Manual Section 76.45.22 and install the instrument panel and carrier.