It's good to hear we're not the only Sedona owners hearing this noise. Yes, it's like a "huge slide whistle"--it starts at a low pitch and quickly rises in a 3- or 4-second "whoop" noise. I swear it sounds as if it starts underneath the van, toward the back, and moves under us to the front as the pitch rises. This is the absolute weirdest noise I've ever heard out of any vehicle. It only happens to us with the A/C on, so I'm assuming somthing strange is going on in that system. Sorry, can't provide any more insight than that.
bit of field testing to try and narrow it down to a describeable, reproducible problem.
was off, though as time has passed it now does it when the front is on and the rear is off or on 1.
been driven awhile, the noise starts up. (It's my theory that by the time the tech looks at it, it is cool enough that there is no noise.)
installed. Neither have had any effect on the noise.
whistle...like a tube filling up with fluid.
been in for service on it 6 times and each time they "fix" something, but the noise lives on.