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.
I too have noticed this problem on my '03 Sedona LX. I have done quite a
bit of field testing to try and narrow it down to a describeable, reproducible problem.
Here are my findings:
> *At first the noise only occurred when the front ac was on and the rear
was off, though as time has passed it now does it when the front is on and the rear is off or on 1.
*It didn't make the noise nearly as much (possibly not at all) during the winter.
> *It definitely makes the noise louder as the outdoor temperature rises.
> *It does not make the noise when the car is relatively cold. After it has
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.)
*I have had the expansion valve replaced and a more insulated coolant line
installed. Neither have had any effect on the noise.
*There is no noise when the A/C button is off.
> *There is no whoosh to the noise, it is more like a huge slide
whistle...like a tube filling up with fluid.
> That's all I have to report on it. It annoys the heck out of me. I've
been in for service on it 6 times and each time they "fix" something, but the noise lives on.
> Any ideas?
>