Hello, I've got a '93 1.6 tdi passat estate. Runs great since I got it a year or so ago.But there is a whirring noise that gets louder the faster u go. It got pretty loud on the motorway recently but the noise reduced when pulling in after over taking.Noise altered on different road surface.Looked at brakes,discs and bearings seems fine.
Any ideas?
Cheers