Aragog

We have a spider living in the side mirror of our car. Every night it builds its web between the side mirror and the driver side window. And every morning it rolls up its web and takes it in between the casing and the mirror. Sometimes, if we go out early enough and start driving, he will come out in a panic and finish rolling up his web as it is flapping in the wind. I can always tell if he has just eaten because his body is big and fat right after a meal. He's not poisonous but he's a big enough spider than you wouldn't want him to bite you. So, my question is should I let this tiny acramantula live, or stop him before he takes over the rest of the car?