Still messing with this? LOL @ some of the replies.
Snakes aren't slimey at all. Your skin is much more moist than a snake's.
If it was 40 degrees the other night, and your car didn't have any warm places to go, the snake is gone. I guarantee it.
Bass isn't going to scare the snake away. They don't have ears. The vibrations may annoy it, but it would most likely just curl up and chill.
The chlorine fumes idea isn't bad.
It's doubtful that the food trap will work. The heating pad will work much better on a cold night. You can a brand new one cheap.
Again, I'd bet money that this snake is no longer alive in your car.