Mercedes Benz C 300 4MATIC # LI83-00_P-048144 Date: 091208
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:
329
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
330
Validity
Attachment - Fresh Air Flap 1
Attachment - Fresh Air Flap 2
331
Attachment - Pictures of Spring Exchange
332
Attachment - Cover of fresh Air/Recirculated Air Flap
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:
329
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
330
Validity
Attachment - Fresh Air Flap 1
Attachment - Fresh Air Flap 2
331
Attachment - Pictures of Spring Exchange
332
Attachment - Cover of fresh Air/Recirculated Air Flap
