Well, I wish I would have saw this thread earlier. I jumped in my truck today and since the radio was off, I noticed this noise...kinda like radio static. So first I cut off the A/C, thinking it could be the fan...nope. Then I had the ingenious thought that it was possibly the noise cancellation making noise to drown out unwanted noise...don't laugh because no thoughts are "bad" when brainstorming... right? Finally, my wife hopped into the truck, turned on her seat and then remarked..."Wow...my ventilated seat makes a lot of noise". (Lightbulb goes off) I cut off my ventilated seat and the mystery noise stopped. I briefly considered not letting my wife know she had just solved my problem (problem solving is man's work), but I figured since we both agree that "I think I know everything", I should take my medicine...and so I confessed. We had a good laugh...but she was laughing a little too hard, lol. Dang truck! It is not supposed to make me look bad! lol