2000 BMW 530 whistle sound

2000 BMW 530
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GILDEVI
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Noises problem
2000 BMW 530 Engine Size unknown Wheel Drive Type unknown Automatic 85,000 miles
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My car makes a whistling sound. I hear it when I start to accelerate and it stops when it hits about 2000 rpm and/or 40mph. On the highway (warmed up? high speed?) it seems to stop. I cleaned out the air filter a couple months ago and it appeared to stop, but now it is back. What is this?
Mar 8, 2008 at 8:13 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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