check the access door/cover to the a/c filters, behind the glovebox. it may
be cracked open. push on it with the a/c on, it may be bowed or bent causing
a whistling noise.
"C" <starunner92@yahoo.com> wrote in message
news:5d6623bc.0407130535.4926f857@posting.google.c om...
> I have a 2001 Civic EX. I'm about to take it in to the dealer for a
> look at something while it's still under warranty-- but they've tried
> to fix it once before to no avail, so I thought I'd see if anyone here
> had any ideas.
>
> Last year, towards the end of the summer, we would hear an occasional
> "whistling" sound while the air conditioner was running. The sound
> was very intermittant-- kind of a high-pitched "whooooop," just a
> second long, once every 3-5 minutes.
>
> So we took it in to the dealer and they replaced the blower.
> Unfortunately it was the end of the summer so we didn't use the AC
> much after that, so we couldn't really test it. Never did hear it
> while using the heater during the winter. Now that summer is back,
> we're using the AC and hearing this weird sound again.
>
> The AC performance doesn't appear to be affected in any way. Would
> appreciate any thoughts anyone might have about what could be causing
> this. Thanks!
>
> starunner92@yahoo.com