Loose air cleaner allowing air to draw through a small opening
downstream of the air filter.
Bad vacuum line allowing air to draw through an area that it shouldn't.
Bad interior control (heat/AC) That is leaking vacuum through a bad
Air leak around the intake manifold that is causing the whistle.
If it is varying with speed ONLY- IE gets louder as the car gets faster
BUT you let off and it doesn't change immediately, look for
Loose piece of body/window trim.
Loose trim/seals around side windows.
"Roy Bragg" < email@example.com> wrote in message
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