Hvac noise in cab

Chevrolet Silverado 1500 2007  140000 miles
I have been hearing a weird noise coming from the dash area. I took it to the dealer and they could not hear it. It is not very loud. If I turn on the air or radio it drowns it out. Once I reach 5 miles and hour the road noise drowns it out. It has been going on for about a month and it does not seem to be getting worse. I planning a 2000 mile trip soon and I want to make sure this nothing serious. I have a video file that I will try to upload here and I plan on visiting the dealership tomorrow. Any suggestions? Fire away.
Skyking75 from United States 4 years ago  
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Skyking75 from United States 4 years ago
I just posted a video that captures the Noise
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