I had this same problem with my Crossfire. And yes, the smell would definitely intensify when the A/C was turned on. I first attempted to clean my cabin air filter and I then sprayed it with a product from NAPA Auto Parts to eliminate odors. The smell then went away...for about a week. I then replaced the cabin air filter ($27 at NAPA) and the smell has gone away permanently. I hope that this works for you!