A/C - Knock Noise From The Glove Box Area

NOISES FROM VICINITY OF GLOVE BOX

Topic number LI83.00-P-048144

Version 1

Design group 83.00 General

Date 12-08-2009

Validity Model series 204

Reason for change Content updated to provide more detail / Supersedes
DTB P-B-83.30/122a

Reason for block

Complaint:

1. Knocking/thumping noises or

2. Cracking/clicking noises from vicinity of glove box

Cause:

1. The knocking/thumping noise can be heard, for example, in stop-and-go traffic. In this case, the fresh air/recirculated air/back pressure flap knocks against the housing and causes this noise.

2. The cracking/clicking noise is caused by the springs of the fresh air/recirculated air/back pressure flap. This can also be heard in stop-and-go traffic.

Remedy:

On vehicles produced before November 2007, proceed as follows for point 1.
Remove the cover under the instrument panel (AR68.10-P-1520CW), then disassemble the glove box (AR68.10-P-1200CW).

After removing the glove box, the housing of the fresh air/recirculated air/back pressure flap is visible. Remove the cover of the fresh air/recirculated air housing

Remove the existing guide pin (2 ea.), cut them off using side cutting pliers.

See pictures in attachment

On vehicles produced before November 2007, proceed as follows for point 2.

Remove the cover under the instrument panel (AR68.10-P-1520CW), then disassemble the glove box (AR68.10-P-1200CW).

Remove the old springs by unhooking them from the lower attachment, then turn through 90°, then detach the springs. Install new springs in reverse order, the retaining points of the springs must be greased. See attachment, spring description

Actuate using DAS, perform a listening test on the springs of the fresh air/recirculated air/back pressure flap under menu items: Air conditioning / Actuation / M2/5 (fresh air/recirculated air flap actuator motor)








Attachments





Symptoms





Parts





Work Units





Validity





Attachment - Fresh Air Flap 1





Attachment - Fresh Air Flap 2





Attachment - Pictures of Spring Exchange





Attachment - Cover of fresh Air/Recirculated Air Flap