This morning i started up the car and almost fainted from the smell. Looks like the car will be towed into the dealership tomorrow.
----------I've also been dealing with this frustrating problem that happened a few weeks ago. I smell a strong gas (almost propane like smell) coming from the AC vents. Also you can smell it coming from under the hood. It's very overpowering at times where I have to roll down the window. I took it in to North County Cadillac (Escondido, CA) and even though my service advisor could smell the strong smell, they said they couldn't isolate the problem. They are pretty bad there.
I just dropped off the car to Hoehn Cadillac (Carlsbad, CA) and the service advisor could smell the strong gas smell not only in the car but also under the hood. I'm really hoping they can isolate the problem this time.