I was driving home, approx 60 mph, with AC on and the fan just stopped for about 20 seconds and then started again. I didn't notice any lights or messages. I've only had the car a couple of days so it's the first time I noticed it.
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I would suspect the Blower Motor Relay or the Blower Motor Resister Pack - I would also check the amp draw of your blower motor to make sure the Blower Motor itself is not at fault