A/C - Whistling Noises From The Ventilation System

WHISTLING NOISES FROM VENTILATION SYSTEM (NOISE CHANGES WITH BLOWER SETTING)

Topic number LI83.00-P-048181

Version 1

Design group 83.00 General

Date 10-28-2009

Validity W164

Reason for change Damage Code updated / Supersedes DTB T-B-83.00/123

Reason for block

Complaint:

Whistling noises from ventilation system in fresh air mode (noises changes with blower setting).

Affected vehicles: production up to approx. 11/2005.

Cause:

Recirculated air/fresh air flap does not close tightly.

Remedy:

Bond a 10 mm thick PE foam block on the sealing edge of the recirculated air inlet housing. The flap should have a gap of approx. 10mm.

The foam block should be approx. 40 mm long and is installed from above though the filter removal opening (see picture).

The air conditioner housing does not need to be removed.

In the case of a complaint, measures must be taken to prevent the sealing lip of the flap from resting against the sealing surface when the flap is in the fresh air position.





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