5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
When do you hear the noise? (engine running & hot, ignition on, or only when AC is active?)
Can you describe it?
The noise starts as soon as I start the car, engine cold, A/C off or on the fan is on, it does not matter if the engine is hot or cold, the thing sounds like an airplane prop. as soon as I disconnect the fan's plug the noise stops
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