F150 high pitch whistle. Its definitely coming from the rear because I can h...

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  1. F150 high pitch whistle. Its definitely coming from the rear because I can hear it through the rear window, and its louder when the rear window is open. It doesn't happen on every start, maybe only 50% of the time. 5L High Pitched Whistle on Acceleration - Have a 2013 Ecoboost 3. This high pitched whistle goes away when I press the recirc button on the climate control. 0L engine, 2019-2020 F-150 vehicles equipped with a 3. You can really hear it when next to a wall in a drive through or when outside the truck walking around it. Recently i have started hearing a high pitched squeal whistle like noise when i accelerate. It is intermittent and only at approximately 2000 rpm. The noise is only produced when at cruising speed. 0 Whistle Solved!!! - I know there are several threads about this but wanted to post my results in hopes that it may help someone else.