We recently replaced the front and mid AC units on the roof of our coach, but the rear one was working fine. That is, until one day it exploded. Or to be more precise, the blower fan, aka squirrel cage, self-destructed. 

A rather disconcerting loud bang. I’ve heard that this is a common failure, but this was the first one we’d experienced.

I looked on RV Help for a nearby tech to fix this for me; I was in Hershey, Pennsylvania at the time. The first tech I contacted never replied, but the second one did, and was able to get the part for me. I didn’t know that the squirrel cage was the issue, but I was pretty confident that it was, so he brought the part with him. Spoiler: I was right.

Mike’s Mobile RV came to the rescue:

Three people, in fact: Mike himself, his wife, and an apprentice:

(I would have preferred some padding on the ladder, though.)

Here’s the broken squirrel cage:

A quick fix.