Strange noise at highway speed

Submitted: Tuesday, Jan 27, 2004 at 14:14
ThreadID: 10053 Views:2649 Replies:5 FollowUps:1
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I have a mitsubishi challenger which has this strange noise at and above 100km/h. It’s difficult to describe, like a constant highish pitch hum, just loud enough to hear it over the stereo, sounds to me like some sort of wind noise. Sounds like it is coming from around the front passenger wheel area, maybe the passenger side engine bay/dash. The rubber splash mats between the engine bay and passenger wheel were split and flapping and I thought it may be them rubbing on the wheel but I tucked them away and it the noise was still there. Seems worse when the prevailing wind is going from right to left across the road and also when the aircon is on. If the wind is gusty the noise starts and stops with the wind gusts. It’s starts at about 100 km/h and gets worse the faster you go, pretty well constant at 120.
It’s been there for a while intermittently but we went away on the long weekend and it was worse and quite annoying.
An ideas??

Thanks in advance.
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