Heating And A/C - Whistling Noise From Footwell Air Vent

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) Technical Service Bulletin # 640611 Date: 110801

Heating And A/C - Whistling Noise From Footwell Air Vent

SI B64 06 11

Heating and Air Conditioning

August 2011

Technical Service

SUBJECT

Whistling Noises Heard from the Heater Footwell Channel

MODEL

E82, E88 (1 Series)

E90, E91, E92, E93 (3 Series)

Vehicles produced from SOP to 9/08/2009 with Automatic Air Conditioning option 0534

SITUATION

A whistling noise is heard coming from the footwell air vent with the IHKA (Integrated Heating and Air Conditioning Automatic) in Auto mode with

the temperature setting slightly lower than the current cabin temperature. This only affects vehicles with a "Valeo" manufactured heater box.

CAUSE

The footwell flap is opened partially to approximately 10%.

PROCEDURE

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) 144

1. Duplicate the complaint.

2. Identify which IHKA housing is installed in the vehicle.

3. Remove the radio receiver (this includes the A/C and heater control panel) and inspect the white label on the front of the heater housing.

4. The label will identify either a Denso or Valeo unit.

5. If it is a Valeo unit, refer to the attachments for the complete repair procedure.

6. If it is a Denso unit, perform standard troubleshooting, as applicable.

PARTS INFORMATION

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) 145

WARRANTY INFORMATION

ATTACHMENT

2010 BMW 335Cic Convertible (E93) L6-3.0L Turbo (N54) 146