It is with some trepidation that I declare that the mystery rattle has been solved (fingers crossed). For about a month (since I got the van) I've been going nuts trying to track down a bizarre rattle. I've been convinced that it was eminating from under the dash, somewhere up behind the glove box. It sounded a bit like someone sticking a popcycle stick in a fan, sometimes quite loud. And now here is the bizarre thing: it seemed to be related most closely to wind speed! It would start at about 60kms and go to about 80kms. Engine rpm didn't matter, road surface didn't matter. But I was convinced it was coming from
inside the van. I tied up every wire I could find, I put foam behind the license plate, I did other crazy things but couldn't figure it out. I was about ready to take a chainsaw to the dashboard when I discovered this:
The little piece of rubber above the headlight had come unglued at one end. I pulled it off. The rattle hasn't come back since.
Peter.