I recently purchased a 2007 Chevy Colorado Crew Cab..
I notice rusting of the bolt on the drivers side seatbelt. I placed my finger underneath the carpet, which was completly soaked with water..
I contacted the dealership, at this time I had notice a small amount of water coming down the back window. They replaced the rear brake light and gasket and sent me on my way. The problem still continued, I took it in again when the dealerships leak specialist was there, this time he said it was a common problem with a bad seal on the inside of the door which he remove the front and rear side drivers side panel and resealed the plastic.
Stil no solution, I contacted the GM complaint centre by a e-mail they contacted me this morning and said they will get in contact with the dealership.
I have checked other used Colorado's at other dealerships and have found the same problem with water underneath the drivers side carpet.
I believe GM has a huge recall in order...