How do I get this Chipmunk Out of My House? [View all]

I have had to shut off my cat's door several times because he brought in a chipmunk. We live on a private road which dead ends, and it's safe to let a cat outside.

In the past, taking his door away has worked well. In fact, it has worked because it's been years since he brought in a chippie. The birds are wise to him. He never catches birds. I think it's because of the unique geography of the place.

Well, the magic wore off and he brought in a chippie yesterday. Poor little thing is behind the radiator in the LR, right across from the front exit. I have had the door open all day, hoping he would make a break for it, but thus far, no.

Any suggestions on how I can get him out of my house?