We have a 68 Coronet R/T sitting in one of those portable garages waiting it’s turn to be restored. This is in CT so the temperature isn’t crazy hot or anything. It’s been a couple of months since it was put in there so we went to start it up on Sunday. There was condensation dripping on the car from the metal garage frame which was somewhat unexpected as this has never happened in one of these shelters before. The thing that is puzzling is that the drivers quarter glass was shattered. Nothing was there that could have hit it and it was still all in place but shattered. Any ideas on what could have caused this?