A/C - Poor Front Defroster Performance at Medium Speed
SI B 64 06 06Heating and Air Conditioning
May 2006
Technical Service
SUBJECT
Front Defroster Performance Poor at Mid-Blower Speeds
MODEL
E90, E91 (3 Series) vehicles produced up to 9/2005
SITUATION
The customer states that at low to mid blower speed, with air directed to the defrost vents (manual mode), the outside edges of the windshield don't clear properly. Poor airflow can be felt at the outer edges of the defroster vent. Note: At high blower speeds the defroster performs properly.
CAUSE
Defroster vent configuration doesn't direct enough airflow to the outer edges of the outlet.
PROCEDURE
On a customer complaint basis only, perform the following procedure.
1. Remove the instrument trim panel as per Repair Manual RA 51 45 030.
2. Turn the instrument panel trim upside down and install both deflector plates (marked L and R) onto the underside ducting of the instrument panel trim as shown in the diagram. Put a drop of super glue on the lip of the duct to hold the deflector plate in place.
3. The diagram to the left shows the installed position of both deflector plates.
4. Reinstall the instrument panel trim and retest the system for correct operation.
PARTS INFORMATION
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.
Defect Code Refer to KSD
Labor Operation: Refer to KSD
Labor Allowance: Refer to KSD
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