A/C - Whistling Noise From Center Outlets

91bmw08

Group 64
Heating and
Air Conditioning


Bulletin Number
64 04 91 (3222)


Woodcliff Lake, NJ
June 1991
Service Engineering


SUBJECT: "Whistling" Noise from Center Outlets - IHKR II/III

MODELS: 5 Series (E34) - produced 1/90 and later





Situation: Under certain condition (e.g., "max warm" position of mixing flap thumbwheel selected, blower speed 3 or 4 selected), a "whistling" noise may occur at the center outlets.

Cause: Different degree of sealing between left and right sides of the mixing flap.

Correction: If this complaint is encountered, the sealing quality of the mixing flap can be improved by increasing its angle of rotation.

This is accomplished by performing the following:

1) Remove mixing flap stepper motor.

2) File away the areas shown (arrows) in the illustrations below. Remove a maximum of one millimeter from the face of the flap driver in each of the two areas shown.


3) Reinstall stepper motor.


Warranty
Information: Labor reimbursable under the terms of the applicable BMW New Car Limited Warranty.

Defect code: 64 11 40 40 00

Labor operation: 00 50 342

Labor allowance: 11 FRU

Any questions regarding warranty coverage should be discussed with your District Service Manager.