I've actually been contemplating removing the internal speaker, in my radio, and putting a fan in its place.
It's not that a Uniden 980 is high powered, and a massive heat generator (it's not, lol), but it does sit on my dashboard. In the winter, when I run the heat, that dash can get hot. I've actually reheated cold coffee by putting in the cupholder that slides out from the dash.
I don't use that speaker, anyway. And, those speaker holes would allow airflow. I suppose that I would just need to find a shielded fan, so it wouldn't interfere with my signal.
I've been wanting a cooling fan on my amp, for the same reason.