question regarding heating/ac fan, 98 voyager

The fan in my 98 voyager completely died, with nothing at all happening when I went through the various rotary switch settings.
When I drove up to the shop, it came on and did fine.
It died again an hour later.
Drove to shop, it's fine.
This has happened a bunch of times by now.
The folk there suggest that it's probably the fan motor with a "dead spot" (they had a differnet term which I've forgotten). They figure what's happening is that sometimes the motor shuts off with everything positioned just wrong, so turning it on does nothing.
Then, a bit later, after some potholes.... it gets shaken and moved enough to get to a "live" portion and comes back.
They recommend replacing the fan assembly (this is the one that's right behind the passenger side glove compartment).
It makes sense to me, but I figured I'd ask around for a second opinion before committing the cash.
Thoughts? Thanks muchly.
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