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)
Today when I started my car I heard a loud whistle sound. The sound continued while I was driving. I also noticed that after about a half hour of driving, my temp gauge was still in the blue. This was the first time this has happened. Does anyone know what thei can be?
Hi, thanks for replying. The sound is coming from under the hood. Sometimes it is a low pitch whistle and then it will get loud. When it is loud it seems like a squealing sound. I noticed when I turned off the car after looking under the hood for the sound that there was an "ERRRRR" sound for about 2 seconds from somewhere under the hood. The AC was off when I looked for the sound.
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