Depending on where the whistle is coming from, you may be able to adjust the vent frame and/or the door glass to eliminate it.
Typically you want the vent frame as high & forward as it will adjust (and fit when closing the door).
Door glass needs to fit tightly to roof seal.
Don't know if you've tried that already, or if the vent glass is whistling at its seal.
On my car it is the vent glass itself where there is a gap that is not sealed. The vent window frame fits and seals well.
Thread turned into a good discussion. Thanks all.
Hopefully someone will come through and come up with good reproductions of the clips.
