I would think it is highly likely it is the fan. I took mine out and ran it on the bench, various start/stop cycles directly with 12V battery. Most of the time on the bench it would work but there was the occasional time when it didn't which I think was due to damaged windings. Fan replaced and has been fine ever since. It is also a good time to ensure you are on top of the cabin filter replacement schedule. For if that is blocked it will cause the fan to work a lot harder.
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