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)
1998 540i squeals like air being let out of a balloon
My 1998 540i makes a strange sound, usually starting once the car reaches 30mph. It's a high pitched squeal, sort of like letting air out of a balloon.
It's coming from the front end somewhere (sort of sounds like its underneath the car), though difficult to pinpoint because it doesn't make the noise while idle.
It gets a bit louder as the speed increases. It also seems to slow while braking. It doesn't make the noise while stationary, and the only time I've heard it below 25 or 30mph is while braking to turn a corner etc.
I had this problem on sons 525i (except for the braking bit which makes it different)
Put duct tape from the windscreen over the top of the grill below the wipers.
The grill vibrates and makes horrible noise which gets worse in a headwind.
The noise was really loud too.
Permanent solution would be to pack the grill with some rubber strips maybe?
If that doesn't work maybe what Brett said or check wheel bearings?
__________________ My daily is a Mitsubishi HSGR (but I wouldn't mind an e34 525i)
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