A/C - Whistling Noises At Speeds Over 50 MPH
SI B 64 02 08Heating and Air Conditioning
April 2009
Technical Service
This Service Information bulletin supersedes SI B64 02 08 dated June 2008.
[NEW] designates changes to this revision
SUBJECT
Whistling from the Heating/Air Conditioning Unit at Speeds over 50 MPH
MODEL
E82, E88 (1 Series)
E90, E91, E92, E93 (3 Series)
Vehicles produced from March 4, 2008 to March 18, 2008
Only vehicles with Valeo heating/air conditioning units installed are affected. Approximately 70% of these vehicles are equipped with heating/air conditioning units provided by Valeo.
SITUATION
In vehicles with the Valeo heating/air conditioning unit in recirculated air mode, a whistling noise can be heard coming from the dash air outlets at speeds over 50 MPH.
CAUSE
The gear drive mechanism of the recirculated air flap is defective.
PROCEDURE
1. Check the supplier of the heating/air conditioning unit by accessing the flap through the engine compartment microfilter housing. Follow the instructions, as outlined in the attachment to this service information, on how to identify the affected Valeo units and how to replace the recirculated air gear.
2. Heating/air conditioning units manufactured by Denso are not affected.
PARTS INFORMATION
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.
ATTACHMENTS
view PDF attachment B640208Procedure.
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