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
Duplicate the complaint.
Identify which IHKA housing is installed in the vehicle.
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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.
The label will identify either a Denso or Valeo unit.
If it is a Valeo unit, refer to the attachments for the complete repair procedure.
If it is a Denso unit, perform standard troubleshooting, as applicable.
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PARTS INFORMATION
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WARRANTY INFORMATION ATTACHMENT
