We are planning to go away to our grandsons wedding this weekend, so I went to tidy up my car and put some tools back in. I keep most of them in the wheel well in the boot, in and around the full size spare wheel.
Today I lifted the floor and the top of the wheel, both metal and rubber were wet with condensation. The same thing with some tools wrapped in poly bags. The bags were wet on the top, but not underneath. I've not come across anything like this before.
It must be condensation because the underside of the lift-up floor is dry. I cleared out the tools and there is no sign on any water ingress, drips or runs. There is a roll of blue paper towels on the floor of the wheel well and they are bone dry. The left side "shelf" has the spare DI unit wrapped in cloth. That is dry. The right hand shelf has my socket set wrapped in a boiler suit. That is completely dry.
I don't think there is any water getting in anywhere else. The windows aren't steaming up since I sealed the new windscreen. And there are no bottles of fluid in the boot that could leak.
The wet part of the wheel in the picture is directly under the lifting floor, so no direct drips.
I'm at a bit of a loss. Any ideas?