I removed my glovebox half a dozen times, the central heater vents and radio to try and find the source of a rattle, ticking and squeak that was driving me nuts for six months or so. This also appeared to be coming from the glovebox area. It really ruined the driving experience to the point of nearly selling the GTI. A trusted friend came out with me on a drive and poked around to discover the hydraulic brake control unit (behind the battery) had a worn rubber mount which was causing a sound to transfer from the chassis to the cabin. Might be worth checking out.