Got in my car this morning, turned the heater on, and once the engine warmed up, a very foul smell began blowing through my vent. When I got to work, I popped the hood, and it smelled atrocious! I'm not sure what's going on, but it smells like a dead rat. Is it possible that there is a dead rat under my hood? I looked around the engine and couldn't find anything. I'll take a closer look when I get home. Just wanted to see if this has happened to anyone else. There is no smoke coming from under the hood, but the smell is really bad. Ideas???