We have a 2007 Fleetwood Excursion and have spent years thinking the whistling was coming from the door. On a recent trip, we tried unlatching the passenger side window and lifting it a fraction of an inch. This fixes the problem.
We can't find a permanent solution but have noticed that the newer coaches have gone to a solid pane window by the passenger seat.
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Janet & Keith
2011 Allegro Bus 43QRP
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