Rear A/C Blower doesn't blow

[hot_and_bothered]

The A/C is great in the front, but suddenly the rear doesn't blow at all, no airflow or noise. A couple of times, seemingly after hitting a bump, it has started to work again, for the rest of the trip; but not after the next restart. (Did not try an immediate restart, just the next time we went out.)

Not much to go on, I know; the fact that it has run a couple times suggests that everything is capable of working correctly, and there probably isn't a blown fuse (unless it's just "mostly" blown). (Couldn't find a separate fuse for that, anyway, but maybe there is one?)

So my next thought is a short or a loose connection, but how the heck would I even begin to look for that?

Don't want to think what it would cost to track it down, either. Needs to be fixed, though. Any help would be appreciated!! thanks!